GUI: Add Select all/none buttons to namespace tree selector

Il2CppInspector.GUI/MainWindow.xaml

@@ -231,6 +231,12 @@
                     <DockPanel DockPanel.Dock="Right" Width="230">
                         <Label DockPanel.Dock="Top" Foreground="{StaticResource WindowsBlue}" FontSize="18">Namespaces</Label>
                         <TextBlock DockPanel.Dock="Top" TextWrapping="WrapWithOverflow" Margin="10,0,5,5">This only applies to C# prototypes output</TextBlock>
+
+                        <StackPanel DockPanel.Dock="Top" Margin="10,0,5,5" Orientation="Horizontal">
+                            <Button Margin="2,0,5,0" Width="103" Click="SelectAllNamespaces_Click">Select all</Button>
+                            <Button Width="103" Click="SelectNoneNamespaces_Click">Select none</Button>
+                        </StackPanel>
+                        
                         <TreeView DockPanel.Dock="Bottom" Name="trvNamespaces" ItemTemplate="{StaticResource NamespaceTreeItemTemplate}" Width="210" Margin="10,5,5,5"></TreeView>
                     </DockPanel>
 

Il2CppInspector.GUI/MainWindow.xaml.cs

@@ -573,6 +573,23 @@ namespace Il2CppInspectorGUI
                         await LoadBinaryAsync(files[0]);
             }
         }
+
+        private void SelectAllNamespaces_Click(object sender, RoutedEventArgs e) {
+            var tree = (IEnumerable<CheckboxNode>) trvNamespaces.ItemsSource;
+
+            // Breadth-first selection
+            for (var level = tree; level.Any(); level = level.Where(node => node.Children != null).SelectMany(node => node.Children))
+                foreach (var item in level)
+                    item.IsChecked = true;
+        }
+
+        private void SelectNoneNamespaces_Click(object sender, RoutedEventArgs e) {
+            var tree = (IEnumerable<CheckboxNode>) trvNamespaces.ItemsSource;
+
+            // Only need to clear the top level because this will clear all the children automatically
+            foreach (var topLevelItem in tree)
+                topLevelItem.IsChecked = false;
+        }
     }
 
     // Replacement for TreeViewItem that includes checkbox state