Created dummy GuiOverlayElement interface for ComposedElement to determine which Elements to draw last

Added methods to retrieve position and size from a GuiElement
Added draw() method with option to override hovered boolean to GuiElement interface and implemented it. This is required for GuiAdvancedButtons which would be tinted blue (as if hovered) even though an overlying GuiElement (e.g. GuiDropdown) was hovered

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

@@ -97,6 +97,11 @@ public class GuiScrollbar extends Gui implements GuiElement {
 
     }
 
+    @Override
+    public void draw(Minecraft mc, int mouseX, int mouseY, boolean hovered) {
+        draw(mc, mouseX, mouseY);
+    }
+
     @Override
     public void draw(Minecraft mc, int mouseX, int mouseY) {
         GlStateManager.resetColor();
@@ -181,4 +186,24 @@ public class GuiScrollbar extends Gui implements GuiElement {
     public void setElementEnabled(boolean enabled) {
         this.enabled = enabled;
     }
+
+    @Override
+    public int xPos() {
+        return positionX;
+    }
+
+    @Override
+    public int yPos() {
+        return positionY;
+    }
+
+    @Override
+    public int width() {
+        return width;
+    }
+
+    @Override
+    public int height() {
+        return SLIDER_HEIGHT;
+    }
 }