[z2120] Drop old condition system in core

Dropping columns from the database will follow soon (TM)

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

(based on commit [12184] - c33dc5a)

(based on commit [s1746] - b667116)
[z2121] Ensure EVENT_T_GENERIC_TIMER is proper initialized on create. Thanks to Reamer for spotting this glitch

(based on commit [12185] - 49ff20a)

(based on commit [s1747] - 31079b1)
[z2122] Add data iterator for SQLStorage to directly iterate over the data

(based on commit [12186] - d02682c)

(based on commit [s1748] - b69ea2a)
[z2123] Add SQLMultiStorage to store SQL tables with multi-index accessing

(based on commit [12187] - c9cdb71)

(based on commit [s1749] - 32b6ad3)