Experimental Windows Ink support

If you're having tablet trouble with Drawpile under Windows 10, here's a new experimental version for you. Normally, Drawpile relies on Qt's built in graphics tablet event handler, which uses the old Wintab API. This experimental update replaces Qt's built-in Wintab support with Krita's new Windows Ink native event handler.

Try out Drawpile 2.0.8 with Windows Ink support

See also the GitHub issue for this feature. Currently, I intend to make this a standard feature in the next release (for the 64 bit version, the 32 bit version will continue to use Wintab,) so if this breaks something for you, please report it so I can hopefully fix it before the actual release.