* changed license for assets from CC BY-NC-SA 3.0 to CC BY-SA 4.0
* fixed debian package
* limit the mainloop's fps
* updated changelog
* updated SDL
* added Tracker support for android
* latest sdl fixes
* track the solution
* fixed class comment
* better tracking for different windows
* started to add opt out option
* reverted parts of SDL
* fixed compilation
* unified tracker names
* updated changelog
* fixed import
* version bump
Merge branch 'master' into geophoto

Conflicts:
	src/caveanddiamonds/CaveAndDiamonds.cpp