Integrate O3D

[bcthund]

Move O3D data into the MapInstance class and integrate into WorldMap so every chunk has it's own O3D data definition.

Because O3D is user placed, the position data will need to be relative to chunk size. Objects will not be placed at say coordinates (512, 256) on a chunk of size 1024, they will be placed at (0.50, 0.25).

[bcthund]

Create a basic O3D System:

• [x] Create O3DSys
• [x] Load map files using chunk coordinates