Gamelab: patch p5 to ignore out-of-bounds in _ontouchstart, _onmousedown

[cpirich]

• We previously patched p5's _updateNextTouchCoords() and _updateNextMouseCoords() to verify that the mouse/touch locations are within the canvas bounds (play space). We now do the same for _ontouchstart() and _onmousedown(). Taps/clicks that begin outside the playspace will not result in state changes or events within p5 or p5play.
• NOTE: we haven't changed how _onmouseup() and _ontouchend() are handled, so taps that begin in the canvas are considered "down" until released, even if the the location is dragged outside of the play space. The coordinates will never exceed the play space limits.

[islemaster]

Is there a reason this line is commented out?

[cpirich]

That's the way it is in the original p5 source. I wanted to leave it that way to ease our future diffs.

[islemaster]

Good fix!