Migrate media tags decoding window from Eto.Forms to Avalonia.

Aaru.Gui/Views/DecodeMediaTagsWindow.xaml

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+<Window xmlns="https://github.com/avaloniaui" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+        xmlns:vm="clr-namespace:Aaru.Gui.ViewModels;assembly=Aaru.Gui"
+        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" mc:Ignorable="d" d:DesignWidth="800"
+        d:DesignHeight="450" Width="480" Height="320" x:Class="Aaru.Gui.Views.DecodeMediaTagsWindow"
+        Icon="/Assets/aaru-logo.png" CanResize="False" Title="{Binding Title}">
+    <Design.DataContext>
+        <vm:DecodeMediaTagsViewModel />
+    </Design.DataContext>
+    <StackPanel Orientation="Vertical">
+        <StackPanel Orientation="Horizontal">
+            <TextBlock Text="Tag:" />
+            <ComboBox Items="{Binding TagsList}" SelectedItem="{Binding SelectedTag}">
+                <ComboBox.DataTemplates>
+                    <DataTemplate>
+                        <TextBlock Text="{Binding Name}" />
+                    </DataTemplate>
+                </ComboBox.DataTemplates>
+            </ComboBox>
+        </StackPanel>
+        <TabControl>
+            <TabItem>
+                <TabItem.Header>
+                    <TextBlock Text="HexView" />
+                </TabItem.Header>
+                <TextBox IsReadOnly="True" Text="{Binding HexViewText}" />
+            </TabItem>
+            <TabItem IsVisible="{Binding DecodedVisible}">
+                <TabItem.Header>
+                    <TextBlock Text="Decoded" />
+                </TabItem.Header>
+                <TextBox IsReadOnly="True" Text="{Binding DecodedText}" />
+            </TabItem>
+        </TabControl>
+    </StackPanel>
+</Window>

Aaru.Gui/Views/DecodeMediaTagsWindow.xaml.cs

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+using Avalonia;
+using Avalonia.Controls;
+using Avalonia.Markup.Xaml;
+
+namespace Aaru.Gui.Views
+{
+    public class DecodeMediaTagsWindow : Window
+    {
+        public DecodeMediaTagsWindow()
+        {
+            InitializeComponent();
+        #if DEBUG
+            this.AttachDevTools();
+        #endif
+        }
+
+        void InitializeComponent() => AvaloniaXamlLoader.Load(this);
+    }
+}