added clearSearchPaths functions to file_functions
CullVisitor now collects Lights and stuffs them into the RenderBin
minor refactoring of fileloading/searchpaths, ViewerApp-baseclass now saves a list of searchpaths
adapted GLFW_App to use GLFW3, still crashing
glfw3 migration almost done, still issues with keyfunc
altered Anttweakbar keyevents to work with glfw3
refactoring, minor issues
glfw migration  complete, merging...
work on feldkirsche project
progess with point_light, altered phong shader, not working yet
shader rewrite lookgin nice so far, still some work...