Make partymodes reload their themes

Move PartyModeIds into Partymodes
Fix bug where wrong text size is used (CalculatedFont is now used)
Fix bug where text of the main table in partymodes is displayed wrong

VocaluxeLib/PartyModes/IPartyMode.cs

@@ -82,7 +82,13 @@ namespace VocaluxeLib.PartyModes
 
     public interface IPartyMode
     {
+        int ID { get; }
         bool Init();
+
+        void LoadTheme(); 
+        void ReloadTextures();
+        void ReloadTheme();
+
         void AddScreen(CMenuParty screen, string screenName);
         void SaveScreens();
         void DataFromScreen(string screenName, Object data);