improving test applications
working on normal map handling
minor stuff
dropping image & cube image texture class and using TextureLoader class
instead
refactor
forgot to add texture loader
refactor
using special sky box shader that scales all positions to far values
cleanuo
working on sprite sphere
sphere sprite
cleanup
Revert "cleanup"

This reverts commit f39e7185a36075048ca2a19db2d6118c8dc7f37a.
dummy
removed unneeded struct
moving Interpolation enum into ShaderInput
better distinguish between uniforms and attributes
cleanup
cleanup: refactor, commenting and some minor stuff
cleanup font handling