[12370] Add support for VS2012 building.

[no ci] for make travis happy ;)
[12371] Implement spell effects for spells 74452 and 74455

Also limit the targets of 74452 depending on dungeon difficulty
[12372] Use recently introduced performance timer for additional state updates

This should give a slight performance improvement without visibly disadvantage for players.
Maybe someone is willing to test 200 as default check intervall, how this scales
[ci skip] (mostly rename :P )
[12373] Don't send Spell::CheckCast fail result for passive auras

No need to notify client when a passive aura failed to cast (like using Cat Form indoor with Feral Swiftness talent learned).

Contributor Maxxie.
[12374] Fix compiler warning about initialization order

Fix warning: '<class>::<member>' will be initialized after <class>::<member>" (Linux/GCC).

Signed-off-by: Schmoozerd <schmoozerd@cmangos>
[12375] Fix some signed/unsigned integer comparison warnings

Close #90 (Pull Request)

Signed-off-by: Schmoozerd <schmoozerd@cmangos>