Implement Physics engine (1st iteration)

[seclerp]

Research result

1. Implement collision between shapes:

   • Circle
   • Rectangle
   • Polygon, Compound Polygon
   • Edge

2. Implement simple API for adding/removing colliders to the physics body (collider = Aether's "fixture", physics body = Aether's "body")

3. Implement game components for collider types and physics body:

   • CircleColliderComponent
   • RectangleColliderComponent
   • PolygonColliderComponent
   • EdgeColliderComponent
   • PhysicsBodyComponent

4. Implement trigger IsTrigger (Aether's "IsSensor") property on colliders

5. Implement raycasting helpers over Aether's raycasting to incapsulate complex and redudant logic into simple but flexible API