Added new Gui with Progress Bar when editing a Replay using the ReplayEditor | https://trello.com/c/uGFDgv6E/

Added ProgressUpdateListener interface for the use with ProgressBars

src/main/java/eu/crushedpixel/replaymod/gui/elements/GuiProgressBar.java

@@ -17,6 +17,10 @@ public class GuiProgressBar extends Gui {
 
     private String progressString = null;
 
+    public GuiProgressBar() {
+        this(0, 0, 0, 0);
+    }
+
     public GuiProgressBar(int xPosition, int yPosition, int width, int height) {
         this(xPosition, yPosition, width, height, 0);
     }

src/main/java/eu/crushedpixel/replaymod/gui/elements/listeners/ProgressUpdateListener.java

@@ -0,0 +1,9 @@
+package eu.crushedpixel.replaymod.gui.elements.listeners;
+
+public interface ProgressUpdateListener {
+
+    void onProgressChanged(float progress);
+
+    void onProgressChanged(float progress, String progressString);
+
+}