Core: Nuke authserver

It has been replaced by bnetserver since grunt was deprecated
DB/Quest: Rallying the Troops

The original fix by @Nevadas is correct according to sniff, when the spell hits the grizzly hills giant in sniff it just gains aura and gives kill credit thats it,

Closes https://github.com/TrinityCore/TrinityCore/issues/4173
Core/Commands: implement .pvpstats command

Shows number of battleground victories in the last 7 days

Closes #13460

Conflicts:
	sql/base/auth_database.sql
	sql/updates/auth/2014_11_10_00_auth.sql
	src/server/game/Accounts/RBAC.h

(cherry picked from commit fd0b96178174e624510a10f5bc27b60af406d901)
Scripts/Commands: mod xp command

Closes #13476

(cherry picked from commit 3e03e546d3106bf8930e30ab9c2008b0e696e125)

Conflicts:
	sql/base/auth_database.sql
	src/server/scripts/Commands/cs_modify.cpp
Rename  2014_11_10_03_world.sql to 2014_11_10_03_world.sql
Merge branch 'Trinity6.x' into brecky6.x