Obstacles

[Katsutoshii]

Obstacles are entities that should stop entities from passing through, like walls. Most won't be moving around

• Create a component for Static entities that don't move, which can be ignored in the outer loop of Object::update and Physics::update.
• Create a TriangleStrip entity that has the following children:
  • Mesh and material for triangle
  • Up to three Object::Obstacle entities to repel other entities.