Added debugDraw for Hitbox (only triggered if they're in a Masklist) + f...

...ixed calc of parent Entity Mask hitbox (partially addresses #241)

Now the hitboxes in a masklist will be visible in the console and the bounds of the entity are calculated correctly.

Minitest: https://github.com/azrafe7/HaxePunk-minitests/tree/master/SimpleTestHitboxMasklist