Announce Joyous Journeys event and max XP rate on login

Added a system message on player login to inform users when the Joyous Journeys event is active and display the maximum allowed XP rate. Also refactored ConfigMaxAllowedRate to public for use in the login announcement.

Author: Nyeriah

src/mod-double-xp-weekend.cpp

@@ -145,6 +145,7 @@ class DoubleXpWeekend
     float ConfigJoyousJourneysXPRate() const { return sConfigMgr->GetOption<float>("XPWeekend.JoyousJourneysXPRate", 1.0f); }
     float ConfigJoyousJourneysRepRate() const { return sConfigMgr->GetOption<float>("XPWeekend.JoyousJourneysRepRate", 1.10f); }
     bool ExcludeInsaneReps() const { return sConfigMgr->GetOption<bool>("XPWeekend.ExcludeInsaneReps", true); }
+    float ConfigMaxAllowedRate() const { return sConfigMgr->GetOption<float>("XPWeekend.MaxAllowedRate", 2.0f) + (IsJoyousJourneysActive() ? ConfigJoyousJourneysXPRate() : 0.0f); }
 
 private:
 
@@ -156,7 +157,6 @@ class DoubleXpWeekend
     float ConfigxpAmount() const { return sConfigMgr->GetOption<float>("XPWeekend.xpAmount", 2.0f); }
     bool ConfigIndividualXPEnabled() const { return sConfigMgr->GetOption<bool>("XPWeekend.IndividualXPEnabled", false); }
     bool ConfigEnabled() const { return sConfigMgr->GetOption<bool>("XPWeekend.Enabled", false); }
-    float ConfigMaxAllowedRate() const { return sConfigMgr->GetOption<float>("XPWeekend.MaxAllowedRate", 2.0f) + (IsJoyousJourneysActive() ? ConfigJoyousJourneysXPRate() : 0.0f); }
     bool ConfigIsDKStartZoneRequired() const { return sConfigMgr->GetOption<bool>("XPWeekend.IsDKStartZoneRequired", false); }
 
     bool IsDKStartZoneComplete(Player* player) const
@@ -312,6 +312,9 @@ class DoubleXpWeekendPlayerScript : public PlayerScript
         DoubleXpWeekend* mod = DoubleXpWeekend::instance();
         ChatHandler handler = ChatHandler(player->GetSession());
         mod->OnPlayerLogin(player, &handler);
+
+        if (mod->IsJoyousJourneysActive() && mod->ConfigJoyousJourneysXPRate())
+            handler.PSendSysMessage("|cff00ccffThe Joyous Journeys event is active! You may set your rates up to {} while it is active!|r", mod->ConfigMaxAllowedRate());
     }
 
     void OnPlayerGiveXP(Player* player, uint32& amount, Unit* /*victim*/, uint8 xpSource) override