Allow guilds to select an in-game outfit to track

[carlst99]

With this feature, Guilds could select an in-game outfit for UVOCBot to follow and collate various statistics about. Suggestions include:

• Congrats message on player rank-up, with customisable interval
• Report on outfit's average scores (total kills, avg. kpm/kdr etc.) over the past week
• Comparison or chart of historical averages
• Monthly VIPs - most time spent, best KDR, best KPH, most TKs

These features should all have individual toggles. Furthermore, each guild should only be able to track up to four outfits each (or whatever the current number of in-game factions is) to prevent unnecessary load on the bot.