add GameType#getAllMapNames

Plugins/Mineplex.MapParser/src/mineplex/mapparser/GameType.java

@@ -157,4 +157,23 @@ public enum GameType
 
 		return mapNames;
 	}
+
+	public static List<String> getAllMapNames()
+	{
+		List<String> mapNames = new ArrayList<>();
+
+		for (GameType gameType : GameType.values())
+		{
+			List<String> gameMapNames = gameType.getMapNames();
+
+			if (gameMapNames == null)
+			{
+				continue;
+			}
+
+			mapNames.addAll(gameMapNames);
+		}
+
+		return mapNames;
+	}
 }