Install icons in $PREFIX/share/icons/hicolor path.

Don't use static paths in .desktop file. Actually I don't know about any application which uses it :P

Conflicts:
	CMakeLists.txt
Show console on windows only in debug mode
Fixed cmake error
Back to previous resolution when escape was pressed in confirm resolution dialog
Fixed conflicts in previous commit
Add icon to exe file as resource.
Strength of bouncy edges should depend on soccer ball mass.

Conflicts:
	src/physics/physical_object.cpp