DB/Quest: Rallying the Troops
Core/Commands: implement .pvpstats command

Shows number of battleground victories in the last 7 days

Closes #13460
Scripts/Commands: mod xp command

Closes #13476
Core/Player: Fix Cosmetic Auto-Repeat Bug

Closes #13532
Fixes #12436
DB/Quest: Sniffing Out the Perpetrator (Alliance)

By @gecko32

Closes https://github.com/TrinityCore/TrinityCore/issues/991