[Feature Request] "Start Selected" for download queue

[ThePoetics]

When adding a playlist to MeTube (or multiple individual videos), if the option to not Auto-Start is chosen, there's no way to bulk-start items in the queue other than clicking each entry individually.

It would be great to have this option, particularly for those playlists which are enormous in length.

This may go hand-in-hand with an option to change the download-start icon to show that it has already been clicked/the download is queued.

Thank you for your great work on this front-end!