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/Battlegrounds/Battleground.cpp

@@ -1382,7 +1382,7 @@ void Battleground::ReadyMarkerClicked(Player* p)
         return;
     readyMarkerClickedSet.insert(p->GetGUIDLow());
     uint32 count = readyMarkerClickedSet.size();
-    uint32 req = GetArenaType() * 2;
+    uint32 req = ArenaTeam::GetReqPlayersForType(GetArenaType());
     p->GetSession()->SendNotification("You are marked as ready %u/%u", count, req);
     if (count == req)
     {