Add a panel for quick access to favorite maps

[hkBattousai]

Every user will have his own list of favorite maps. I currently keep my list in a text file, and copy/paste a map name into the search box to access it. It would make it much easier if QuakeInjector kept a list of favorite maps.

[hrehfeld]

Thanks for the suggestion, that's a nice idea!

Will need to think about this also in the context of #69. I would suggest to have a tab/option to show only maps you rated (and then sort by rating).