Update Ghoul repository

- Not working.

Right now just adding a bunch of mod files, i know this is rather ugly but i just need it to work for friday.

- Started working on PowerScaling with some initial changes
- Faking the stars by blending with the abuffer
- Changed texture filtering for planets, looks better in my opinion

- Added PowerScaling to RenderableVolumeGL and RenderableFieldlines
- Removed the use of volumeraycasterbox since it used FBO and textures
which was not used anymore.
- Added a simple box implementation to RenderableVolumeGL that can have
PowerScaled vertex positions

TODO: The #include command needs to be extended in some way since the
FieldLines passthrough shader can't access the PowerScaled includes in a
good way.

- Added separete files for the power scaling algorithms
- Added shader tracking and updating for the new files

- Added jitter to volume rendering, reducing artefacts
- Added tracking of more shader files to update the resolve shader

- Added Licence to shaders

- Refactored several files
- Implemented PositionInformation subclasses
- Added standard shaders in the shader directory
- Removed SceneGraphLoader, now integrated in the SceneGraph

- TODO: Further testing and improvements to the PowerScale coordinate
system

added OpenSpaceEngine
added ConfigurationManager
added query functions
removed GLEW-related Windows warning
added old external control classes
more restructuring