Add support for all token types with the new semantic highlighting

Summary of the new feature

Powershell has 20 tokentypes and it would be nice if the semantic highlighting supported all of them. See: https://docs.microsoft.com/en-us/dotnet/api/system.management.automation.pstokentype

The current semantic highlighting implementation is currently missing the following types:

• Attribute
• CommandArgument
• GroupEnd/GroupStart
• LineContinuation (backtick)
• LoopLabel
• StatementSeparator (Semicolon)

If/When these gets added I would suggest changing the following mappings:

• Value in Using namespace <Value> should use CommandArgument scope. Currently it uses Function.
• Attributes like [cmdletbinding()] should use Attribute scope. Currently it uses Type.
• Names in functions and configurations should use CommandArgument scope. Currently they use the Function scope except functions with no dashes which has no semantic token type.
• Unquoted parameter values like "C:\SomePath" in Get-ChildItem C:\SomePath should use CommandArgument scope. Currently they use the function scope.

The following screenshot hopefully shows what I mean:

Start with the current semantic highlighting implementation and compare its token mappings with the documented PowerShell PSTokenType values. Check the listed missing token types and proposed remappings, then verify that all are represented and that the examples use the requested scopes.