Added two new API calls, to update the server to a particular version and to get the updater status
You can now update through the UI, and a status dialog displays after
Created arg modifier dialog to assist in editing youtube-dl args
- This arg dialog contains all the available args and their description
- Includes a convenient search bar and categorized list of args to help you find the one you're looking for, or just explore what's available.
Arg modifier is available for both global args (in settings) and local args (in the advanced mode)
