Icon not correctly handled

[Jacalz]

Hi! Thanks for providing a great Pacman game!

The icon isn't really correctly handled on Linux. The correct way of doing it is putting the icon in to /usr/share/icons and then setting the icon in the .desktop file to be just pacman. This will let icon themes that have a pacman icon use that and if the icon theme doesn't have one, then it will use your icon.

Link for more information:
https://askubuntu.com/questions/435603/desktop-files-how-to-specify-the-icon-path

Example of Qsynth where it puts it's icons:
https://dev.getsol.us/source/qsynth/browse/master/pspec_x86_64.xml