Touchscreen support

[Po Lu]

I implemented the events required for full touchscreen support for
XInput 2.  These events are generated only for DirectTouch devices,
which means real touchscreens only, no touchpads.

Please take a look and see if the API I'm exposing is useful, and also
easy enough to implement on non-X platforms.

If there are no problems, I would like to install this.

Thanks.

0001-Add-support-for-touchscreen-events-generated-by-XInp.patch
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