Add geometry for simple collision detection

[ChristianGreiner]

At the moment Duality supports only a rectangle to detect an AABB collision.

Some geometry stuff to implement:

• Line2D
• Circle
• Polygon

Collision detection:

• Line-Line
• Line-Circle
• Line-Rec
• Line-Point
• Line-Polygon
• Circle-Circle
• Circle-Rec
• Circle-Point
• Circle-Polygon
• Rec-Polygon