added globalScale to draw methods
fixed existing errors
fixed another error
many things now use the globalScale
fixed size of tower shadow rectangle
Enemy now rendered at the right position
GUI scale now works
moved gui scale and game scale to Gameplay
fixed a bug where you could not place towers on far right side
made height and width of the screen static again
background is now also drawn outside of map

the tiles outside of the area where enemies move is painted darker
fixed problems
fixed issue where tower was not placed correctly
fixed an issue, where the debug circles were not drawn correctly
Towers should now shoot correctly
cleanup
automatic scaling should be better now
NOW it should work
cleanup
Merge branch 'feature/issue/#30' into develop