CMaNGOS Playerbots "lfg" command implemented (#1291)

* CMaNGOS Playerbots "lfg" command implemented

* Remove logging, fix warning, add suggestion

- Remove LOG_INFO's console clutter, since 'lfg' command is working correctly now.
- Warning C26813 fixed for: placeholders["%role"] = (role == BOT_ROLE_TANK ? "tank" : (role == BOT_ROLE_HEALER ? "healer" : "dps"));
- Added suggestion to let bots do autogear & maintenance, so players can instantly start their dungeon or raid activities without manually having to configure the playerbots gear. It could save a lot of time. This is up to discussion for playerbots maintainers.

src/strategy/actions/AcceptInvitationAction.cpp

@@ -22,8 +22,7 @@ bool AcceptInvitationAction::Execute(Event event)
     std::string name;
     packet >> flag >> name;
 
-    // Player* inviter = ObjectAccessor::FindPlayer(grp->GetLeaderGUID());
-    Player* inviter = ObjectAccessor::FindPlayerByName(name, true);
+    Player* inviter = ObjectAccessor::FindPlayer(grp->GetLeaderGUID());
     if (!inviter)
         return false;
 
@@ -36,11 +35,17 @@ bool AcceptInvitationAction::Execute(Event event)
         return false;
     }
 
+    if (bot->isAFK())
+        bot->ToggleAFK();
+
     WorldPacket p;
     uint32 roles_mask = 0;
     p << roles_mask;
     bot->GetSession()->HandleGroupAcceptOpcode(p);
 
+    if (!bot->GetGroup() || !bot->GetGroup()->IsMember(inviter->GetGUID()))
+        return false;
+
     if (sRandomPlayerbotMgr->IsRandomBot(bot))
         botAI->SetMaster(inviter);
     // else