misc: chore: [ci skip] small Avalonia project restructure

Moved the Views that existed in the Controls namespace into the Ryujinx.Ava.UI.Views.Misc namespace
Moved UpdateWaitWindow to Ryujinx.Ava.UI.Windows

src/Ryujinx/UI/Windows/UpdateWaitWindow.axaml

@@ -0,0 +1,35 @@
+<Window
+    x:Class="Ryujinx.Ava.UI.Windows.UpdateWaitWindow"
+    xmlns="https://github.com/avaloniaui"
+    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+    Title="Ryujinx - Waiting"
+    SizeToContent="WidthAndHeight"
+    WindowStartupLocation="CenterOwner"
+    CanResize="False"
+    mc:Ignorable="d"
+    Focusable="True">
+    <Grid
+        Margin="20"
+        HorizontalAlignment="Stretch"
+        VerticalAlignment="Stretch" ColumnDefinitions="Auto,*" RowDefinitions="Auto,Auto">
+        <Image
+            Grid.Row="1"
+            Height="70"
+            MinWidth="50"
+            Margin="5,10,20,10"
+            Source="resm:Ryujinx.Assets.UIImages.Logo_Ryujinx.png?assembly=Ryujinx" />
+        <StackPanel
+            Grid.Row="1"
+            Grid.Column="1"
+            VerticalAlignment="Center"
+            Orientation="Vertical">
+            <TextBlock Name="PrimaryText" Margin="5" />
+            <TextBlock
+                Name="SecondaryText"
+                Margin="5"
+                VerticalAlignment="Center" />
+        </StackPanel>
+    </Grid>
+</Window>