RAGE: Scene Node Controller Tests

This is a test for a "bare bones" game engine with a scene graph and an OpenGL-based rendering system allowing the creation of a 3D scene to be rendered in real-time.

This particular set of tests is meant to show working Controllers, which are objects that apply their implemented behavior to all the Nodes that are under their control.

Controller test case summary:

1. Translation: moves Nodes along a given axis.
2. Rotation: rotates the Nodes about a given axis.
3. Scaling: modifies the scale/size of the Nodes along a given axis
4. Orbit: translates Nodes around another target Node

Note that if the Node being rotated with a RotationController is the parent of other Nodes, the child Nodes may end up orbiting their own parent at the same speed when they're some distance away from the parent's center.

While that seems to negate the need for an OrbitController, that's not really the case. Some reasons for including an OrbitController include:

1. Target Node does not need to be in a parent-child relationship with orbiting/controlled Nodes;
2. Target and controlled Nodes can have their own independent rotation and orbit speeds (i.e. the orbital speed of a controlled Node is not forced to match the rotation speed of the parent)
3. Target and controlled Nodes can go in different directions