Added debugging rectangle to utils.js
Added basic collision

A spatial partitioning implementation using quadtrees.
Collision.js still needs work.
Improved debugging rectangle util
Added AOE , collision detection to projectile

new property : AOE,
also added functionality to allow visual debugging and basic collision
detection
Updates to files in order to implement collision

All colliding objects are held in the array Game.colliders.
Each colliding Destructible should be added to this array on creation