change id entity type to a fixed sized of 32 bit
Merge branch 'create_sigma_h' of https://github.com/catageek/Sigma into catageek-create_sigma_h

Had to move some items into the Sigma namespace.

Conflicts:
	include/systems/OpenGLSystem.h
	src/components/GLScreenQuad.cpp
	src/systems/OpenGLSystem.cpp
Merge branch 'develop' into Refactor_Movers_in_ECS