added star highlighting, progress saving

assets/gui_main_menu.json

@@ -26,7 +26,8 @@
 					"paddingLeft": 10,
 					"paddingRight": 10,
 					"itemSpacing": 20,
-					"children" : [{
+					"children" : [
+					{
 							"type": "HorizontalLinearLayout",
 							"name": "row1",
 							"paddingBottom": 15,

assets/shaders/hoverable-button.fragment

@@ -0,0 +1,16 @@
+precision highp float;
+
+uniform sampler2D Texture;
+uniform bool Hover;
+varying vec2 texCoord;
+varying vec4 color;
+
+void main() 
+{
+	vec4 texColor = texture2D(Texture,texCoord).rgba;
+	gl_FragColor =  color * texColor.rgba;
+	if (Hover)
+	{
+		gl_FragColor.xyz *= 1.5;
+	}
+}