DB/Creature: Fix Living Storm coords

By Magnifikator closes #11785
Buildsystem: Changed required CMake version to 2.8.9 and removed a check for version we no longer support in msvc settings
Build system: Fix clang build

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Scripts/Icecrown Citadel: Fixed Muradin/Saurfang attacking each other during Gunship Battle

Closes #11786
Merge branch 'master' of https://github.com/TrinityCore/TrinityCore