Fix physics collider bug

Resolves issue where removing an entity from the scene while it is collided would cause an unhandled exception. Thanks to @InfiniteLee for identifying the issue and the solution.

Bug fix

v0.1.1

0.1.1

Improved collision detection

v0.1.0

0.1.0

Inital release

v0.0.1

attract gif; known issue note