[7141] Implement heroic raid instance mode support.
* Heroic mode player amount for instances in DB. Can be used for any instances but added for heroic raid instance.
* Output transfer error at max playrs limit.
* FIXME notes ;) for raid required implementing store 2 reset time and do global reset for 2 modes. But currently raid have inmmap entry data
same reset time for both cases.
* Update instances list where mounts allowed.
* Simplify and fix code for SMSG_RAID_INSTANCE_INFO.
Signed-off-by: VladimirMangos <vladimir@getmangos.com>