Support Progress on Task Bar Entries

I'm currently migrating some of the stuff that was handled by the WindowsAPICodePack to use WinForms APIs (like the new [TaskDialog](https://github.com/dotnet/winforms/issues/146) and the new [FolderBrowserDialog](https://github.com/dotnet/winforms/issues/1)). As described in #181, individual issues should be opened for feature requests.

The WindowsAPICodePack had this API to set the progress of the window in the task bar:
```csharp
TaskbarManager.Instance.SetProgressValue(value, maximum, windowHandle)
```
It also supported different states like `Indeterminate`:
```csharp
TaskbarManager.Instance.SetProgressState(TaskbarProgressBarState.Indeterminate)
// Defined as:
public enum TaskbarProgressBarState
{
NoProgress = 0,
Indeterminate = 1,
Normal = 2,
Error = 4,
Paused = 8,
}
```

The result looks like in [this](https://www.codeproject.com/Articles/37451/Display-Progress-and-Overlay-Icons-for-Multiple-Vi) article:

**Will this feature affect UI controls?** Yes
- Will VS Designer need to support the feature?
- No
- What impact will it have on accessibility?
- I guess none, because the feature is already in use in windows itself and some applications
- Will this feature need to be localized or be localizable?
- No

Keywords:
- WindowsAPICodePack
- Task Bar Progress