Player and buttons refactoring...
Fixed player movement issue
Working on buttons anf #64.
Fixed #66
Drawn some toolbar images
Added Overlay class
Refactored Zombie. Now he can hold any type of weapon.
More refactoring
Refactoring for Overlay finished
Fixed button bug
Removed unnecessary dependencies
Drawn some toolbar images
Added Overlay class
Refactoring for Overlay finished
Merging complete