This functions essentially the same as the language selector. The language selector now also checks the currently set option on launch, and both the language and theme selectors spawn a popup prompting the user to restart NUSGet after selecting a new value.
Still need to add a popup telling you that NUSGet needs to be restarted after changing the language, and having it load the selected language in the selection menu so that it's checked on launch.
Defined menu roles for those items so that Qt knows they belong under "NUSGet" when on macOS. This worked automatically somehow in English, but when loading a localization they'd be relocated to "Help" like they are on Windows and Linux. They'll now stay in the correct place for all languages.
Title trees are now model-based rather than item based. Coming with this is proper item metadata, so the data and UI are finally disconnected, making future development much easier. There are also some minor visual improvements as a result of using a TreeView instead of a TreeWidget.
vWii System Menus now have public versions defined in the database. Public version display code has also been entirely rewritten, as the version displayed in the interface and the version used by the code are no longer the same.
Entire UI is now locked out during downloads to prevent changing options and breaking things, and new titles cannot be selected from the list mid-download