GitLab

* ambient occlusion refactored as a decorator
* pre-integrated raycaster and processor to pre-integrate TF

* Updated TextureManager
* Fixed some warnings and minor cleanup

* CSHelper ns contains methods to simplify boilerplate code
* some changes to the cgt::Texture interface
* Shader code now dumped to console when compilation fails (could still use some reworking, i.e. like line numbers)
* updated MedianFilter code