Adding the GameMode class.

This is the RunMode that controls the game. Fairly self explanatory in my
mind. Probably less self-explanatory in reality. Feel free to branch off
of this for different modules.
Adding basic game World class.

More framework... one step at a time.
Adding managers for the game world.
Pleasing the return statement monster.
Merge branch 'worldframework' into somethingtodowithentities

Fixed issues with metadata for project files integrating into other
metadata for other files.

Conflicts:
	Nimbus.vcxproj
	Nimbus.vcxproj.filters