[x] prepare cmake to have three different libraries
[x] move all common descriptions to the core
[x] move all scene descriptions to the scene library
[x] make sure all scene/renderer objects are within the glrt::scene//renderer namespace
[x] make sure all Header Guards have the right prefix, for example #ifndef GLRT_RENDERER_DEBUGGING_VISUALIZATIONRENDERER_H instead of #ifndef GLRT_DEBUGGING_VISUALIZATIONRENDERER_H
#ifndef GLRT_RENDERER_DEBUGGING_VISUALIZATIONRENDERER_Hinstead of#ifndef GLRT_DEBUGGING_VISUALIZATIONRENDERER_H