refactor dialogue handling for various game entities

src/de/miaurizius/jgame2d/entity/item/PotionObj.java

@@ -22,12 +22,16 @@ public class PotionObj extends Entity {
 
         price = 50;
         stackable = true;
+
+        setDialogue();
+    }
+
+    public void setDialogue() {
+        dialogue[0][0] = "You drank a " + name + "!\nYour life has been recovered by " + value + ".";
     }
 
     public boolean use(Entity entity) {
-        panel.gameState = GameState.DIALOGUE;
-        panel.ui.currentDialogue = "You drank a " + name + "!\n" +
-                "Your life has been recovered by " + value + ".";
+        startDialogue(this,0);
         entity.life += value;
         if(panel.player.life > panel.player.maxLife) panel.player.life = panel.player.maxLife;
         panel.playSE(2);