Added option to play track from context menu dialog

[Bettehem]

Hello again!
I have added an option to the context menu dialog which allows to play the track or add to queue. This solves #786.

There's one problem currently though. In the dialog where you can select to play now or add to queue, only arrow keys work.
When trying to use j and k, it scrolls the list in the background and not in the dialog, so this probably shouldn't be merged until that is solved.

[hrkfdn]

Hi there, thanks for the PR. Would love to merge this, but it appears to contain commit 9a97a6e from your other PR. Could you remove that commit?

[Bettehem]

Oh, my bad, I hadn't noticed that. I have removed it now.

[hrkfdn]

Thank you! Merged :)

[Bettehem]

Nice! There's a problem though, j and k don't work in the new dialog, only arrow keys do. j and k scrolls the list in the background of the dialog and not inside the dialog itself. Any suggestions how to fix this?

[hrkfdn]

@Bettehem: Ah, should be fixed with 52e2a53 :)

Two things were missing: the type in handle_move_command for the select items was not matching and commands were not forwarded to the context menu in the command handler. There's still a lot of boilerplate involved when creating context menus :(

[Bettehem]

Oh I see! This is good to know if I work with context menus in the future. Thanks!