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/MailHandler.cpp

@@ -14,6 +14,7 @@
 #include "ObjectMgr.h"
 #include "Opcodes.h"
 #include "Player.h"
+#include "ScriptMgr.h"
 #include "World.h"
 #include "WorldPacket.h"
 #include "WorldSession.h"
@@ -196,9 +197,7 @@ void WorldSession::HandleSendMail(WorldPacket& recvData)
         }
     }*/
 
-    uint32 rc_account = receive
-                        ? receive->GetSession()->GetAccountId()
-                        : sObjectMgr->GetPlayerAccountIdByGUID(rc);
+    uint32 rc_account = receive ? receive->GetSession()->GetAccountId() : sObjectMgr->GetPlayerAccountIdByGUID(rc);
 
     if (/*!accountBound*/ GetAccountId() != rc_account && !sWorld->getBoolConfig(CONFIG_ALLOW_TWO_SIDE_INTERACTION_MAIL) && player->GetTeamId() != rc_teamId && AccountMgr::IsPlayerAccount(GetSecurity()))
     {
@@ -255,6 +254,9 @@ void WorldSession::HandleSendMail(WorldPacket& recvData)
             return;
         }
 
+        if (!sScriptMgr->CanSendMail(player, rc, mailbox, subject, body, money, COD, item))
+            return;
+
         items[i] = item;
     }