NekoRectangle removal and replaced by RectangleSkin FeathersUI native class

src/view/MainHeader.hx

@@ -1,9 +1,9 @@
 package view;
 
+import feathers.skins.RectangleSkin;
 import com.adobe.cairngorm.control.CairngormEvent;
 import com.adobe.cairngorm.control.CairngormEventDispatcher;
 import components.IconButton;
-import components.NekoRectangle;
 import control.AppController;
 import feathers.controls.Button;
 import feathers.controls.Label;
@@ -37,11 +37,7 @@ class MainHeader extends LayoutGroup {
         final headerHeight = Std.int(sh * Constants.MAIN_HEADER_HEIGHT_RATIO);
 
 		autoSizeMode = CONTENT;
-		backgroundSkin = new NekoRectangle( Constants.HERO_COLOR, 
-                                            0, 
-                                            0, 
-                                            headerWidth, 
-                                            headerHeight);
+		backgroundSkin = new RectangleSkin(SolidColor(Constants.HERO_COLOR, 1));
 		variant = LayoutGroup.VARIANT_TOOL_BAR;
 
         // Layout settings
@@ -60,7 +56,7 @@ class MainHeader extends LayoutGroup {
 		
         // Title label
         lbl1 = new Label();
-        //lb1.backgroundSkin = new NekoRectangle(Constants.ACCENT_COLOR2);
+        //lb1.backgroundSkin = new RectangleSkin(SolidColor(Constants.ACCENT_COLOR2, 1));
 
 		//lb1.verticalAlign = VerticalAlign.TOP;
 		lbl1.text = Constants.MENU_ITEM_0_STRING;