refactor collision handling and improve game state reset functionality

src/de/miaurizius/jgame2d/core/UI.java

@@ -29,7 +29,7 @@ public class UI {
     private int transCount;
     private int sleepCount;
     private int charIndex;
-    private String combinedText = "";
+    private String combinedText;
 
     // SUB-STATES
     public TradeState tradeState = TradeState.SELECT;
@@ -757,7 +757,6 @@ public class UI {
         if(commandNum == 1) {
             graphics2d.drawString(">", textX-25, textY);
             if(panel.keyH.spacePressed) optionState = OptionState.OVERVIEW;
-            panel.resetGame(true);
         }
     }