Slope movement patch

Pushed a quick fix for various bugs, mobile control support still WIP

• Debug menu teleport dropdown no longer keeps focus
• Jumping while moving up slopes works now

On a separate note, interesting limitation I've run in to which might linger as it feels almost intuitive:

Very thin steps can be ascended but when moving very quickly there's a bug pushing the player back down, it feels almost like tripping up the stairs.  Step depth sizes under 0.2 (in engine world units) are untested and normal width stairs don't cause the bug.

I also tweaked the default movement speed values to be a bit fast.  They'll come back down eventually, but I've found them useful for testing edge cases.