Removed traces of MOAIGlobalClassFinalizer
Cleared method bodies in MOAICamera2D.

They are only stubs to attach Doxygen comments to, not actual working code. Same as MOAITransform2D, MOAILayer2D, and MOAIProp2D.
Removed method declarations without implementations
Added missing include
Code cleanup
Fixed documentation
Cleaned up rename of MOAIPartitionLayer to MOAIPartitionLevel (issue #222)

There were still some fields, variables, and comments referring to partition
levels as "layers". Also, the unit tests still tried calling methods by their old names.
Merge pull request #982 from DanielSWolf/code-cleanup

Code cleanup