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/GroupHandler.cpp

@@ -14,6 +14,7 @@
 #include "Opcodes.h"
 #include "Pet.h"
 #include "Player.h"
+#include "ScriptMgr.h"
 #include "SocialMgr.h"
 #include "SpellAuras.h"
 #include "Util.h"
@@ -74,6 +75,9 @@ void WorldSession::HandleGroupInviteOpcode(WorldPacket& recvData)
         return;
     }
 
+    if (!sScriptMgr->CanGroupInvite(GetPlayer(), membername))
+        return;
+
     if (GetPlayer()->IsSpectator() || player->IsSpectator())
     {
         SendPartyResult(PARTY_OP_INVITE, membername, ERR_INVITE_RESTRICTED);
@@ -224,6 +228,9 @@ void WorldSession::HandleGroupAcceptOpcode(WorldPacket& recvData)
         return;
     }
 
+    if (!sScriptMgr->CanGroupAccept(GetPlayer(), group))
+        return;
+
     if (group->GetLeaderGUID() == GetPlayer()->GetGUID())
     {
         sLog->outError("HandleGroupAcceptOpcode: player %s(%d) tried to accept an invite to his own group", GetPlayer()->GetName().c_str(), GetPlayer()->GetGUIDLow());