feat(Core/Hooks): added collection of hooks to extends AC (#3047)

This collection of hooks comes from the Maelstrom project. It allows to release modules such as :
- 3v3-soloqueue
- 1v1 arena
- pvestats

and many others

src/server/game/Handlers/TradeHandler.cpp

@@ -12,6 +12,7 @@
 #include "ObjectAccessor.h"
 #include "Opcodes.h"
 #include "Player.h"
+#include "ScriptMgr.h"
 #include "SocialMgr.h"
 #include "Spell.h"
 #include "World.h"
@@ -640,6 +641,9 @@ void WorldSession::HandleInitiateTradeOpcode(WorldPacket& recvPacket)
         return;
     }
 
+    if (!sScriptMgr->CanInitTrade(_player, pOther))
+        return;
+
     // OK start trade
     _player->m_trade = new TradeData(_player, pOther);
     pOther->m_trade = new TradeData(pOther, _player);