#20 Voxelization CPU : voxelizing triangles WIP

- voxelize on button press
- voxelize triangles beginning to take shape
- still weird positions and stuff
- still not all tests functional
- additional Singleton : RenderState to keep track of active OpenGL
stuff and so on
- methods to remove renderables and nodes and delete nodes aswell
#13 Camera Node Refactoring : close to done

- camera can now be moved via mouse
- a little clunky, but it works