- Added a new utility class Color.
	- A major part of their methods have been taken (moved) from class PackableColor.
	- Instances of PackableColor have been replaced by instances of Color in all places not related to packables.
- Multiples unused includes have been removed and others have been replaced by more specific includes (ie. glm/vec3.hpp instead of glm/glm.hpp)
- AuxiliarLinesRenderer's constructor now requires the local user's color as an argument. This is used for setting the color of guide rects.