Fixed normal map texture slot
replaced Texture class with Material class (grouped textures)
added fps counter
Fixed loading meshes without active UV channel
added missing Material class
Label text align (for FPS counter)
Merge remote-tracking branch 'v0rtex/master'

Conflicts:
	src/gui/Label.cpp
	src/main.cpp
Fixed Mesh loading without UVs and rendering without material.
Moved stuff to a debug scene, added free camera and some debug models/textures
merged.
fixed rendering