Frontend: * Added a basic campaign page/selection - just missing missions and real progress (don't count on this being active in 0.9.14)

Frontend: * Forgot to update team search to new extension

Frontend: * Simplified the code to setup config structure and prepared it to enable user accessible asset directories * Renamed team file extensions from ".ini" to ".hwt" (Hedgewars Team) * Added campaign progress to teams (I know, no campaign ... yet)