added Grid Texture
Added Hover texture
Funktionen:
   Ebene + Textur
   Tastatureingabe
Merge branch 'dev' of https://github.com/AndreasTB/RollingBalls into dev
added Placing Towers and Removing placed towers.
added flying Balls, Balls are moving, removing Balls is also working
Changed Latex Docs to include new Information
Updated Docs regarding Pathfinding