Started laying out the GameGrid class which will store all grid data going forward.
Everything is now switched over to using the separate GameGrid contained within the GridManager.
Multiple elevation levels are now implemented
Changed the level file to work with the new grid settings.
Merge branch 'master' into tiered_grid
Follow-up to the merge commit, changing the merged code to use the new GameGrid interface
Merge branch 'master' into tiered_grid

Conflicts:
	VajraFramework/ExampleGame/Code/ExampleGame/Components/Grid/GridManager.cpp
Addressing comments on pull request
Merge branch 'master' into tiered_grid

Conflicts:
	VajraFramework/ExampleGame/Code/ExampleGame/Components/GameScripts/Units/PlayerUnit.cpp
Merge pull request #64 from VajraFramework/tiered_grid

Tiered grid