Removing old test models. AH-299
Moved .tx files from model assets to separate folder. AH-299
Changed the use of default textures to .dds. AH-299
Removed unnecessary files. Fixed bug with model using jpg. AH-299
Removed unnecessary light models. AH-299
Removed old test level with colored cubes. AH-299
Added new textures and replaced "texture not found" with dds. AH-299
Removed unnecessary test models. AH-299
Merge branch 'master' into AH-291_ForwardRendering
AH-291_ForwardRendering

Merge with master and activated forward rendering and render skybox once again.