Custom configuration for each game (#632)

![image](https://github.com/user-attachments/assets/5dd139b4-2004-4c13-85d1-fc3378382adf)

![image](https://github.com/user-attachments/assets/9bcb8524-a403-428f-9f98-e8c03c75f079)

Now you can make a separate configuration (independent file) for each
game. All emulator settings are available except for some UI functionality ones. 
The configuration file can be changed and deleted from a separate menu. The
user configuration menu is available through the context menu on a given application.

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Co-authored-by: Evan Husted <greem@greemdev.net>

src/Ryujinx/UI/Controls/ApplicationContextMenu.axaml

@@ -19,6 +19,18 @@
         Header="{ext:Locale GameListContextMenuCreateShortcut}"
         Icon="{ext:Icon fa-solid fa-bookmark}"
         ToolTip.Tip="{OnPlatform Default={ext:Locale GameListContextMenuCreateShortcutToolTip}, macOS={ext:Locale GameListContextMenuCreateShortcutToolTipMacOS}}" />
+    <MenuItem
+        Click="EditGameConfiguration_Click"
+        IsVisible="{Binding SelectedApplication.HasIndependentConfiguration}"
+        Header="{ext:Locale GameListContextMenuEditCustomConfiguration}"
+        Icon="{ext:Icon fa-solid fa-gear}"
+        ToolTip.Tip="{ext:Locale EditCustomConfigurationToolTip}" />
+    <MenuItem
+       Click="EditGameConfiguration_Click"
+       IsVisible="{Binding !SelectedApplication.HasIndependentConfiguration}"
+       Header="{ext:Locale GameListContextMenuCreateCustomConfiguration}"
+       Icon="{ext:Icon fa-solid fa-gear}"
+       ToolTip.Tip="{ext:Locale CreateCustomConfigurationToolTip}" />
     <MenuItem
         IsVisible="{Binding HasCompatibilityEntry}"
         Click="OpenApplicationCompatibility_Click"