[2819] Fix issue for quest 1249

Signed-off-by: Xfurry <xfurry@scriptdev2.com>
[2820] Use the new ScriptEffect call in SD2. Requires CMangos [12409]
[2821] Implement script for spell 21050

This will fix quest 6661

Thanks tarwyn and Nett118 for the info

Close #22
[2822] Fix some instance reload issues on Zul'Aman

Thanks zkillertheman for pointing