Connected the playerAdded / playerRemoved signals sent by the category manager with the CatTabWidget for proper GUI-updates in case of changes
Enabled group configuration with an "ugly" number of groups (e.g. "7" instead of "8")

Added a test scenario with 250 players and one category with 40 players
Added "Finals" to the start levels after group matches.
Modified the UI to leave the player list enabled in singles categories to give the user the opportunity to scroll through the list.