Add touch event cases to PassThroughInputManager

[frenzibyte]

Split from #2925

• Depends on Implement touch input & handling support #3269

Adds touch event cases to the PassThroughInputManager for propagating touch input to the hierarchy.

[frenzibyte]

I believe the mouse button synchronization is done as-is (release stale but don't press new) for the input to not potentially be mistaken as a click, not the case for touches so decided it to follow the rest.

[bdach]

While that makes sense to me (clicks are transient, discrete events, while a touch is persistent), it may be something worth documenting in some way.

[frenzibyte]

Yeah definitely, will push another branch for that.