[10156] Add shared object for auras of same spell and move spell proc code to its own file, also spread procs by auras and effect indexes.

src/game/SpellHandler.cpp

@@ -457,6 +457,12 @@ void WorldSession::HandleCancelAuraOpcode( WorldPacket& recvPacket)
         return;
     }
 
+    SpellAuraHolder *holder = _player->GetSpellAuraHolder(spellId);
+
+    // not own area auras can't be cancelled (note: maybe need to check for aura on holder and not general on spell)
+    if (holder && holder->GetCasterGUID() != _player->GetGUID() && HasAreaAuraEffect(holder->GetSpellProto()))
+        return;
+
     // non channeled case
     _player->RemoveAurasDueToSpellByCancel(spellId);
 }