wrote gtkmm3 migration roadmap
implemented first FindGtkmm3.cmake module search script
space-deminer is now compilable using gtkmm3
todo-file: added idea letting the planet-generator render and save as hdr-images
PlanetGenerator: Is now compilable using gtkmm3
Merge branch 'develop' into issue-switch-to-gtk3
Todo-List: added note to use multithreading in imageformat conversion
removed old unnecessary stuff
The planet-generator Splashscreen has now transparency again
impoved Splashscreen drawing at startup
added source information
Planet-Generator: replaced on_expose_event with on_draw
Planet-Generator: removed avery appereance of on_size_request
Render is now rendering into an rgb buffer
The SfmlWidget now doesn't pop up shortly while loading the application
Planet-Generator: Raytracer: View is now working again
Todo-List: added bug about broken conversion  from RGBA_4x8_PM -> RGBA_4x8
Planet-Generator: The application now doesn't crush anymore when closing the window while reviewving the render result
Removed dithering from colorRGBA
removed dithering option from the raytrace settings