Revert "[InstanceScripts:] Archavon initial script"

This reverts commit 168c122bab6806f28cd5e0db793d2eed90344767.
[InstanceScripts:] Archavon initial script
[InstanceScripts:] UtgardePinnacle initial script
Aurius scripted
[InstanceScripts:] ForgeOfSouls initial script
GossipScripts:] Cleaning + fixed/new scripts
Added the new files to CMake and setups