UI - Restructured resources directory

UI - Fixed a few memory leaks

src/Artemis.UI/Screens/IScreenViewModel.cs

@@ -1,11 +1,8 @@
-using MaterialDesignThemes.Wpf;
-using Stylet;
+using Stylet;
 
 namespace Artemis.UI.Screens
 {
     public abstract class MainScreenViewModel : Screen
     {
-        public int DisplayOrder { get; set; }
-        public PackIconKind DisplayIcon { get; set; }
     }
 }