Add window icon, make the title bar draggable and drop the full-screen caption button

Use the Starter icon for the window and the executable; the whole caption strip drags the window. Extending the client area makes Avalonia 12 add an extra full-screen toggle to the window chrome (which lives in its own host, so it is not reachable from the window's visual tree); it is hidden globally in App.axaml via its WindowDecorationProperties.ElementRole. Standard minimize / maximize / close are kept.

StarterNG/StarterNG.csproj

@@ -8,6 +8,7 @@
         <Nullable>enable</Nullable>
         <BuiltInComInteropSupport>true</BuiltInComInteropSupport>
         <ApplicationManifest>app.manifest</ApplicationManifest>
+        <ApplicationIcon>Assets\starter.ico</ApplicationIcon>
         <AvaloniaUseCompiledBindingsByDefault>true</AvaloniaUseCompiledBindingsByDefault>
         <AssemblyVersion>1.2.0.4</AssemblyVersion>
         <FileVersion>1.2.0.4</FileVersion>
@@ -48,6 +49,8 @@
       <AvaloniaResource Include="Assets\Logo\*.png" />
       <None Remove="Assets\Test\ep07p.bmp" />
       <AvaloniaResource Include="Assets\Test\ep07p.bmp" />
+      <None Remove="Assets\starter.ico" />
+      <AvaloniaResource Include="Assets\starter.ico" />
     </ItemGroup>
 
     <ItemGroup>