changed preferences shortcut

scopviz/src/main/java/de/tu_darmstadt/informatik/tk/scopviz/main/MainWindow.fxml

@@ -33,7 +33,7 @@
             <MenuItem fx:id="save" accelerator="Shortcut+S" mnemonicParsing="false" text="Save" />
             <MenuItem fx:id="saveAs" accelerator="Shortcut+Shift+S" mnemonicParsing="false" text="Save As…" />
             <SeparatorMenuItem mnemonicParsing="false" />
-            <MenuItem fx:id="preferences" accelerator="Shortcut+P" mnemonicParsing="false" text="Preferences" />
+            <MenuItem fx:id="preferences" accelerator="Alt+ENTER" mnemonicParsing="false" text="Preferences" />
             <SeparatorMenuItem mnemonicParsing="false" />
             <MenuItem fx:id="quit" mnemonicParsing="false" text="Quit" />
           </items>

scopviz/src/main/java/de/tu_darmstadt/informatik/tk/scopviz/ui/handlers/KeyboardShortcuts.java

@@ -36,10 +36,6 @@ public final class KeyboardShortcuts {
 	final static KeyCombination rAltShift = new KeyCodeCombination(KeyCode.R, KeyCombination.ALT_DOWN,
 			KeyCombination.SHIFT_DOWN);
 
-	/**
-	 * preferences shortcut
-	 */
-	final static KeyCombination pCtrl = new KeyCodeCombination(KeyCode.P, KeyCombination.CONTROL_DOWN);
 
 	/**
 	 * Private constructor to prevent Instantiation.
@@ -118,10 +114,6 @@ public final class KeyboardShortcuts {
 
 			}
 
-			else if (pCtrl.match(event)) {
-				MenuBarManager.preferencesAction(new ActionEvent());
-			}
-
 			else if (event.getCode().equals(KeyCode.RIGHT)) {
 				if (GraphDisplayManager.getCurrentLayer().equals(Layer.SYMBOL)) {
 					MapViewFunctions.switchToNextWaypoint();