adjusted the layout of level group screen and highscore screen
shortened the setting description
added alpha version of Level 10 medium
Merge branch 'master' of https://github.com/FAU-Inf2/fly-gdx
Merge branch 'master' of https://github.com/FAU-Inf2/fly-gdx
Merge branch 'master' of https://github.com/FAU-Inf2/fly-gdx
updated speed upgrade, added 2 new levels
removed decimal numbers in info overlay of speed upgrade, corrected the angle of gates, added new level
did a wrong correction of gate rotation
Merge branch 'master' of https://github.com/FAU-Inf2/fly-gdx