Add static getCubeIntegerPosition() method to TerrainGrid class
Add static getCubeFloatPosition() method to TerrainGrid class
Add whatCubeTargeted() method in Player class who color the targeted cube
Fix the problem of viewing a cube in another grid than our
Upgrade the whatCubeTargeted() function to return a grid index (int)
Add removeCube() method to TerrainGrid class
Add the cube destruction
Merge branch 'select_bloc' into terrain_renderer

Conflicts:
	src/imacraft/Player.cpp
	src/imacraft/Renderer.cpp
	src/main.cpp
Fix problem of point lights and multiple grids
Add QuadInstance class
Merge branch 'terrain_renderer' of https://github.com/Jijidici/MANcraft-Project into terrain_renderer