UI: Move ApplicationContextMenu in a separated class (#4755)

* UI: Move ApplicationContextMenu in a separated class

This PR remove duplicated code related to the context menu on the Application list/grid by create a control for the menu which include related handler.

I've renamed "GameList/GameGrid" by "Application" for consistencies. And I've removed all uneeded field from the project file too.

While I cleaned up things, I've found an issue about purging Ptc/Shader cache, both methods list files even if the user say "No", shader cache is purged even if the user say "No". It's fixed.

* Adresses feedbacks

src/Ryujinx.Ava/UI/Controls/ApplicationGridView.axaml

@@ -0,0 +1,102 @@
+<UserControl
+    x:Class="Ryujinx.Ava.UI.Controls.ApplicationGridView"
+    xmlns="https://github.com/avaloniaui"
+    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+    xmlns:controls="clr-namespace:Ryujinx.Ava.UI.Controls"
+    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+    xmlns:flex="clr-namespace:Avalonia.Flexbox;assembly=Avalonia.Flexbox"
+    xmlns:helpers="clr-namespace:Ryujinx.Ava.UI.Helpers"
+    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+    xmlns:ui="clr-namespace:FluentAvalonia.UI.Controls;assembly=FluentAvalonia"
+    d:DesignHeight="450"
+    d:DesignWidth="800"
+    Focusable="True"
+    mc:Ignorable="d">
+    <UserControl.Resources>
+        <helpers:BitmapArrayValueConverter x:Key="ByteImage" />
+        <controls:ApplicationContextMenu x:Key="ApplicationContextMenu" />
+    </UserControl.Resources>
+    <Grid>
+        <Grid.RowDefinitions>
+            <RowDefinition Height="*" />
+        </Grid.RowDefinitions>
+        <ListBox
+            Grid.Row="0"
+            Padding="8"
+            HorizontalAlignment="Stretch"
+            VerticalAlignment="Stretch"
+            ContextFlyout="{StaticResource ApplicationContextMenu}"
+            DoubleTapped="GameList_DoubleTapped"
+            Items="{Binding AppsObservableList}"
+            SelectionChanged="GameList_SelectionChanged">
+            <ListBox.ItemsPanel>
+                <ItemsPanelTemplate>
+                    <flex:FlexPanel
+                        HorizontalAlignment="Stretch"
+                        VerticalAlignment="Stretch"
+                        AlignContent="FlexStart"
+                        JustifyContent="Center" />
+                </ItemsPanelTemplate>
+            </ListBox.ItemsPanel>
+            <ListBox.Styles>
+                <Style Selector="ListBoxItem">
+                    <Setter Property="Margin" Value="5" />
+                    <Setter Property="CornerRadius" Value="4" />
+                </Style>
+                <Style Selector="ListBoxItem:selected /template/ Border#SelectionIndicator">
+                    <Setter Property="MinHeight" Value="{Binding $parent[UserControl].DataContext.GridItemSelectorSize}" />
+                </Style>
+            </ListBox.Styles>
+            <ListBox.ItemTemplate>
+                <DataTemplate>
+                    <Grid>
+                        <Border
+                            Margin="10"
+                            HorizontalAlignment="Stretch"
+                            VerticalAlignment="Stretch"
+                            Classes.huge="{Binding $parent[UserControl].DataContext.IsGridHuge}"
+                            Classes.large="{Binding $parent[UserControl].DataContext.IsGridLarge}"
+                            Classes.normal="{Binding $parent[UserControl].DataContext.IsGridMedium}"
+                            Classes.small="{Binding $parent[UserControl].DataContext.IsGridSmall}"
+                            ClipToBounds="True"
+                            CornerRadius="4">
+                            <Grid>
+                                <Grid.RowDefinitions>
+                                    <RowDefinition Height="Auto" />
+                                    <RowDefinition Height="Auto" />
+                                </Grid.RowDefinitions>
+                                <Image
+                                    Grid.Row="0"
+                                    HorizontalAlignment="Stretch"
+                                    VerticalAlignment="Top"
+                                    Source="{Binding Icon, Converter={StaticResource ByteImage}}" />
+                                <Panel
+                                    Grid.Row="1"
+                                    Height="50"
+                                    Margin="0,10,0,0"
+                                    HorizontalAlignment="Stretch"
+                                    VerticalAlignment="Stretch"
+                                    IsVisible="{Binding $parent[UserControl].DataContext.ShowNames}">
+                                    <TextBlock
+                                        HorizontalAlignment="Stretch"
+                                        VerticalAlignment="Center"
+                                        Text="{Binding TitleName}"
+                                        TextAlignment="Center"
+                                        TextWrapping="Wrap" />
+                                </Panel>
+                            </Grid>
+                        </Border>
+                        <ui:SymbolIcon
+                            Margin="5,5,0,0"
+                            HorizontalAlignment="Left"
+                            VerticalAlignment="Top"
+                            FontSize="16"
+                            Foreground="{DynamicResource SystemAccentColor}"
+                            IsVisible="{Binding Favorite}"
+                            Symbol="StarFilled" />
+                    </Grid>
+                </DataTemplate>
+            </ListBox.ItemTemplate>
+        </ListBox>
+    </Grid>
+</UserControl>