[12538] Implement some custom use for Effect Activate Object spells

This will fix the summoning events for the Wind Stones, Ice Stones, Skettis bosses and quest 11865

Close scriptdev2/scriptdev2#50
[12539] Update some Sunwell Plateau spells

Limit targets and allow positive effect for spell 46650
Implement effect for spells 46289 and 46637
Remove effect for spell 44845 - will be handled in script library
Merge pull request #1 from cmangos/master

merge