[Core] Fixed possible mount abuse after leaving BattleGround
Credit to @ShinDarth [c12711]
[Core] Better DB values check when loading battleground_template
Display error if MinPlayersPerTeam > MaxPlayersPerTeam
Allow testers to start a BG without opening more than one client (using
MinPlayersPerTeam = 0)
Credit to @ShinDarth [c12712]
[Core] Implement two more TEMPFACTION_TOGGLE flags
 * UNIT_FLAG_PACIFIED
 * UNIT_FLAG_NOT_SELECTABLE
Credit to @Grz3s and @xfurry [c12713]
[Core] Remove config UseNewStats
From core view it's expected that proper data for CreatureClassLevel
stats are shipped.
Individual NPCs can always be "deactivated" by using the Expansion = -1
key.

Also remark that for proper flooding w/ error messages you need to
deactivate the DB-Strict Filter (at least for the time being..)

Credit to @Schmoozerd [c12715]
[Tools] Fix problem with scaling vmap model. VMap and MMap need to be
rebuilt.
Credit to @Shauren [c12718]
[Documentation] Add forgotten part of a previous comment
Credit to @xfurry [c12722]
[Core] Fix druid mana on shapeshift
Credit to @xfurry [c12725]