[TW279] - Core/Battlegrounds: Increase AV frequency

Allows AV to start if last BG was at least 13v13. Also prevents starting a second AB, EotS or SotA. AV will start instead.
[TW] - Core/Spells: Fix Rotu & Rotd cd
[TW280] - Core/Scripts: ToCh - Clean up the AI for the city lesser champions at the Grand Champions encounter
[TW281] - Core/Scripts: ToCh - Make charging more dynamic, so champions charge at all
[TW282] - Core/Scripts: ToCh - Get rid of an event spam, still at lesser champions' AI
[TW283] - Core/Scripts: ToCh - Clean up an ancient hack, step forward a reset method for Grand Champions
[TW284] - Core/Scripts: ToCh - Readd a flag that wasn't supposed to be gone
[TW285] - Core/Scripts: ToCh - Fix Grand Champion's encounter malfunctioning after crashes
TW fix Cobra Reflexes
[TW286] - Core/Scripts: ToCh - Makes it so the Grand Champions' encounter  can be reset in case of wipes and massive clean up
[TW287] - Core/Scripts: ToCh - Also clear up some arrays for convenience
Merge pull request #15 from gecko32/Truewow

[TW] - Core/Spells: Fix Rotu & Rotd cd
Merge pull request #16 from Unholychick/patch-5

TW fix Cobra Reflexes
[TW288] - Core/Scripts: Make Sindragosa's Ice Tombs immune to knockback effects
[TW] DB/Achievement Add missing sql code for 25 man if looks could kill.
Merge pull request #17 from gecko32/Truewow

[TW] DB/Achievement Add missing sql code for 25 man if looks could kill.
Merge branch 'master' of https://github.com/TrueWoW/TrinityCore

Conflicts:
	src/server/game/Battlegrounds/BattlegroundMgr.cpp