Since we move to .NET7, JsonSerializer now needs to have explicit options as arguments, which leads to some warnings in Avalonia project. This is fixed by using our `JsonHelper` class.
* Avalonia: Another Cleanup
This PR is a cleanup to the avalonia code recently added:
- Some XAML file are autoformatted like a previous PR.
- Dlc is renamed to DownloadableContent (Locale exclude).
- DownloadableContentManagerWindow is a bit improved (Fixes#3491).
- Some nits here and there.
* Fix GTK
* Remove AttachDebugDevTools
* Fix last warning
* Fix JSON fields
* remove content dialog placeholder from all windows
* remove redundant window argument
* redesign user profile window
* wip
* use avalonia auto name generator
* add edit and new user options
* move profile image selection to content dialog
* remove usings
* fix updater
* address review
* adjust avatar dialog size
* add validation for user editor
* fix typo
* Shorten some labels
* Add all other windows
* addreesed review
* Prevent "No Update" option from being deleted
* Select no update is the current update is removed from the title update window
* fix amiibo crash
