Native pen and touch support for Windows

[cgutman]

Description

This PR implements native pen and touch support for Windows using the Sunshine protocol extensions and InjectSyntheticPointerInput() which was introduced in Windows 10 1809. It also implements the core plumbing needed for supporting this feature on Mac and Linux.

Most major pen/touch features are supported including:

• 10-point multitouch
• Contact area
• Pressure
• Rotation and tilt
• Hover (though not distance, due to Windows API limitations)
• Pen buttons (only 1, due to Windows API limitations)

This implementation is currently limited to direct input devices where the pen/touch device is associated with a screen. It does not currently support independent devices like standalone drawing tablets (and likely never will on Windows, due to API limitations).

cc: @ABeltramo

Screenshot

Issues Fixed or Closed

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Dependency update (updates to dependencies)
• Documentation update (changes to documentation)
• Repository update (changes to repository files, e.g. .github/...)

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have added or updated the in code docstring/documentation-blocks for new or existing methods/components

Branch Updates

LizardByte requires that branches be up-to-date before merging. This means that after any PR is merged, this branch
must be updated before it can be merged. You must also
Allow edits from maintainers.

• I want maintainers to keep my branch updated

[XPRAMT]

Using a stylus pen and multitouch may experience intermittent lag (approximately every 10 to 20 seconds).
https://www.youtube.com/watch?v=ZJRAMEsHK3g