Separate the WindowsDesktop SDK from the WPF runtime

The WindowsDesktop SDK needs to be removed from the WPF runtime and placed in its own branch to prepare it for inclusion in the dotnet/SDK repo.

This will allow WPF to take updates and fixes to the markup compiler much more frequently.

In addition to the entire PresentationBuildTasks project, these files must also be included:
```
src\Microsoft.DotNet.Wpf\src\Common
src\Microsoft.DotNet.Wpf\src\Directory.Build.Props
src\Microsoft.DotNet.Wpf\src\PresentationBuildTasks
src\Microsoft.DotNet.Wpf\src\PresentationCore
src\Microsoft.DotNet.Wpf\src\PresentationFramework
src\Microsoft.DotNet.Wpf\src\Shared
src\Microsoft.DotNet.Wpf\src\WindowsBase
src\Microsoft.DotNet.Wpf\src\Common\src
src\Microsoft.DotNet.Wpf\src\Common\src\System
src\Microsoft.DotNet.Wpf\src\Common\src\System\AppContextDefaultValues.cs
src\Microsoft.DotNet.Wpf\src\Common\src\System\LocalAppContext.cs
src\Microsoft.DotNet.Wpf\src\Common\src\System\SR.cs
src\Microsoft.DotNet.Wpf\src\PresentationCore\MS
src\Microsoft.DotNet.Wpf\src\PresentationCore\System
src\Microsoft.DotNet.Wpf\src\PresentationCore\MS\internal
src\Microsoft.DotNet.Wpf\src\PresentationCore\MS\internal\Media
src\Microsoft.DotNet.Wpf\src\PresentationCore\MS\internal\Media\ParserStreamGeometryContext.cs
src\Microsoft.DotNet.Wpf\src\PresentationCore\MS\internal\Media\XamlSerializationHelper.cs
src\Microsoft.DotNet.Wpf\src\PresentationCore\System\Windows
src\Microsoft.DotNet.Wpf\src\PresentationCore\System\Windows\LocalizationCategory.cs
src\Microsoft.DotNet.Wpf\src\PresentationCore\System\Windows\Media
src\Microsoft.DotNet.Wpf\src\PresentationCore\System\Windows\Modifiability.cs
src\Microsoft.DotNet.Wpf\src\PresentationCore\System\Windows\Readability.cs
src\Microsoft.DotNet.Wpf\src\PresentationCore\System\Windows\Media\Knowncolors.cs
src\Microsoft.DotNet.Wpf\src\PresentationCore\System\Windows\Media\ParsersCommon.cs
src\Microsoft.DotNet.Wpf\src\PresentationCore\System\Windows\Media\StreamGeometryContext.cs
src\Microsoft.DotNet.Wpf\src\PresentationFramework\MS
src\Microsoft.DotNet.Wpf\src\PresentationFramework\System
src\Microsoft.DotNet.Wpf\src\PresentationFramework\MS\Internal
src\Microsoft.DotNet.Wpf\src\PresentationFramework\MS\Internal\Globalization
src\Microsoft.DotNet.Wpf\src\PresentationFramework\MS\Internal\Globalization\LocalizationComments.cs
src\Microsoft.DotNet.Wpf\src\PresentationFramework\System\Windows
src\Microsoft.DotNet.Wpf\src\PresentationFramework\System\Windows\Markup
src\Microsoft.DotNet.Wpf\src\PresentationFramework\System\Windows\SystemResourceKey.cs
src\Microsoft.DotNet.Wpf\src\PresentationFramework\System\Windows\Markup\AttributeData.cs
src\Microsoft.DotNet.Wpf\src\PresentationFramework\System\Windows\Markup\BamlBinaryWriter.cs
src\Microsoft.DotNet.Wpf\src\PresentationFramework\System\Windows\Markup\BamlMapTable.cs
src\Microsoft.DotNet.Wpf\src\PresentationFramework\System\Windows\Markup\BamlRecordHelper.cs
src\Microsoft.DotNet.Wpf\src\PresentationFramework\System\Windows\Markup\BamlRecords.cs
src\Microsoft.DotNet.Wpf\src\PresentationFramework\System\Windows\Markup\BamlRecordWriter.cs
src\Microsoft.DotNet.Wpf\src\PresentationFramework\System\Windows\Markup\BamlVersionHeader.cs
src\Microsoft.DotNet.Wpf\src\PresentationFramework\System\Windows\Markup\KnownTypes.cs
src\Microsoft.DotNet.Wpf\src\PresentationFramework\System\Windows\Markup\KnownTypesHelper.cs
src\Microsoft.DotNet.Wpf\src\PresentationFramework\System\Windows\Markup\MarkupExtensionParser.cs
src\Microsoft.DotNet.Wpf\src\PresentationFramework\System\Windows\Markup\ParserContext.cs
src\Microsoft.DotNet.Wpf\src\PresentationFramework\System\Windows\Markup\ParserHooks.cs
src\Microsoft.DotNet.Wpf\src\PresentationFramework\System\Windows\Markup\ParserStack.cs
src\Microsoft.DotNet.Wpf\src\PresentationFramework\System\Windows\Markup\StyleModeStack.cs
src\Microsoft.DotNet.Wpf\src\PresentationFramework\System\Windows\Markup\StyleXamlParser.cs
src\Microsoft.DotNet.Wpf\src\PresentationFramework\System\Windows\Markup\TemplateXamlParser.cs
src\Microsoft.DotNet.Wpf\src\PresentationFramework\System\Windows\Markup\TreeBuilder.cs
src\Microsoft.DotNet.Wpf\src\PresentationFramework\System\Windows\Markup\TypeContext.cs
src\Microsoft.DotNet.Wpf\src\PresentationFramework\System\Windows\Markup\XamlBrushSerializer.cs
src\Microsoft.DotNet.Wpf\src\PresentationFramework\System\Windows\Markup\XamlInt32CollectionSerializer.cs
src\Microsoft.DotNet.Wpf\src\PresentationFramework\System\Windows\Markup\XamlNodes.cs
src\Microsoft.DotNet.Wpf\src\PresentationFramework\System\Windows\Markup\XAMLParseException.cs
src\Microsoft.DotNet.Wpf\src\PresentationFramework\System\Windows\Markup\XamlParser.cs
src\Microsoft.DotNet.Wpf\src\PresentationFramework\System\Windows\Markup\XamlPathDataSerializer.cs
src\Microsoft.DotNet.Wpf\src\PresentationFramework\System\Windows\Markup\XamlPoint3DCollectionSerializer.cs
src\Microsoft.DotNet.Wpf\src\PresentationFramework\System\Windows\Markup\XamlPointCollectionSerializer.cs
src\Microsoft.DotNet.Wpf\src\PresentationFramework\System\Windows\Markup\XamlReaderConstants.cs
src\Microsoft.DotNet.Wpf\src\PresentationFramework\System\Windows\Markup\XamlReaderHelper.cs
src\Microsoft.DotNet.Wpf\src\PresentationFramework\System\Windows\Markup\XamlSerializer.cs
src\Microsoft.DotNet.Wpf\src\PresentationFramework\System\Windows\Markup\XamlStyleSerializer.cs
src\Microsoft.DotNet.Wpf\src\PresentationFramework\System\Windows\Markup\XamlTemplateSerializer.cs
src\Microsoft.DotNet.Wpf\src\PresentationFramework\System\Windows\Markup\XamlTypeMapper.cs
src\Microsoft.DotNet.Wpf\src\PresentationFramework\System\Windows\Markup\XamlVector3DCollectionSerializer.cs
src\Microsoft.DotNet.Wpf\src\PresentationFramework\System\Windows\Markup\XmlAttributeProperties.cs
src\Microsoft.DotNet.Wpf\src\PresentationFramework\System\Windows\Markup\XmlnsCache.cs
src\Microsoft.DotNet.Wpf\src\PresentationFramework\System\Windows\Markup\XmlnsDictionary.cs
src\Microsoft.DotNet.Wpf\src\Shared\MS
src\Microsoft.DotNet.Wpf\src\Shared\README.md
src\Microsoft.DotNet.Wpf\src\Shared\RefAssemblyAttrs.cs
src\Microsoft.DotNet.Wpf\src\Shared\System
src\Microsoft.DotNet.Wpf\src\Shared\MS\Internal
src\Microsoft.DotNet.Wpf\src\Shared\MS\Internal\CriticalExceptions.cs
src\Microsoft.DotNet.Wpf\src\Shared\MS\Internal\ResourceIDHelper.cs
src\Microsoft.DotNet.Wpf\src\Shared\MS\Internal\SecurityHelper.cs
src\Microsoft.DotNet.Wpf\src\Shared\MS\Internal\TokenizerHelper.cs
src\Microsoft.DotNet.Wpf\src\Shared\MS\Internal\Xaml
src\Microsoft.DotNet.Wpf\src\Shared\MS\Internal\Xaml\Parser
src\Microsoft.DotNet.Wpf\src\Shared\MS\Internal\Xaml\Parser\SpecialBracketCharacters.cs
src\Microsoft.DotNet.Wpf\src\Shared\System\Windows
src\Microsoft.DotNet.Wpf\src\Shared\System\Windows\Markup
src\Microsoft.DotNet.Wpf\src\Shared\System\Windows\Markup\ReflectionHelper.cs
src\Microsoft.DotNet.Wpf\src\Shared\System\Windows\Markup\Replacements
src\Microsoft.DotNet.Wpf\src\Shared\System\Windows\Markup\RuntimeIdentifierPropertyAttribute.cs
src\Microsoft.DotNet.Wpf\src\Shared\System\Windows\Markup\TypeConverterHelper.cs
src\Microsoft.DotNet.Wpf\src\Shared\System\Windows\Markup\XmlCompatibilityReader.cs
src\Microsoft.DotNet.Wpf\src\Shared\System\Windows\Markup\XmlWrappingReader.cs
src\Microsoft.DotNet.Wpf\src\Shared\System\Windows\Markup\Replacements\TypeUriConverter.cs
src\Microsoft.DotNet.Wpf\src\WindowsBase\MS
src\Microsoft.DotNet.Wpf\src\WindowsBase\System
src\Microsoft.DotNet.Wpf\src\WindowsBase\MS\Internal
src\Microsoft.DotNet.Wpf\src\WindowsBase\MS\Internal\IO
src\Microsoft.DotNet.Wpf\src\WindowsBase\MS\Internal\IO\Packaging
src\Microsoft.DotNet.Wpf\src\WindowsBase\MS\Internal\IO\Packaging\Compoundfile
src\Microsoft.DotNet.Wpf\src\WindowsBase\MS\Internal\IO\Packaging\Compoundfile\ContainerUtilities.cs
src\Microsoft.DotNet.Wpf\src\WindowsBase\System\IO
src\Microsoft.DotNet.Wpf\src\WindowsBase\System\Windows
src\Microsoft.DotNet.Wpf\src\WindowsBase\System\IO\Packaging
src\Microsoft.DotNet.Wpf\src\WindowsBase\System\IO\Packaging\Compoundfile
src\Microsoft.DotNet.Wpf\src\WindowsBase\System\IO\Packaging\Compoundfile\FormatVersion.cs
src\Microsoft.DotNet.Wpf\src\WindowsBase\System\IO\Packaging\Compoundfile\versionPair.cs
src\Microsoft.DotNet.Wpf\src\WindowsBase\System\Windows\Markup
src\Microsoft.DotNet.Wpf\src\WindowsBase\System\Windows\Markup\DateTimeConverter2.cs
src\Microsoft.DotNet.Wpf\src\WindowsBase\System\Windows\Markup\TypeTypeConverter.cs```