started working on the test app, it craches nicely :)
Added missing call to Context.LoadAll to init gl context
Merge branch 'master' into test_app
Context is made current before calling LoadAll
added shut down callback in graphics backend
test app is up 'n running-ish
renderering backend now takes clear color on beginpass
the correct shader handles and shader source is used when compiling shaders instead of the default values
import is parsed correctly  in the shader preprocessor
added cook_torrance and utility shaders to test the preprocessor properly
fixed regex for shader preprocessor
shader version is set by shader loader instead of specified in file
generic.hlsl used #ifdef instead of #if