Player health and dying

[Autofire]

Depends on #1

Pretty self explanatory.

• Enemy attacks should collide with the player (when they intersect the player's grid space) and deal damage to them.
• When the player gets hit, some kind of effect should trigger.
• When the player dies, reset the scene (or have some kinda game over screen).
• The player needs to know how much health they have remaining.

[KyleTownsend74]

Can add:
-Sound effect
-controller rumble
-screen visual effect (red outline, desaturated colors)