Add score API

api/src/main/java/de/erethon/dungeonsxl/api/player/PlayerGroup.java

@@ -332,6 +332,20 @@ public interface PlayerGroup {
      */
     void removeReward(Reward reward);
 
+    /**
+     * Returns the score number, which is used for capture the flag and similar game types.
+     *
+     * @return the score number
+     */
+    int getScore();
+
+    /**
+     * Sets the score of this group to a new value.
+     *
+     * @param score the value
+     */
+    void setScore(int score);
+
     /**
      * Returns the initial amount of lives or -1 if group lives are not used.
      *