The right click option on SimpleOptionChooser is hard to discover

[nloomans]

Hi, elementary Music is by far the best music play on Linux, but there is just one issue that is a deal breaker for me.

I usually just pick one song I really like and set it on repeat, and then I work while listing to the same song for like an hour, unfortunately there is no repeat one option.

I think it's best to stick to the industry standard for this one, for that we just give the repeat button three states; On the first click it enables repeat, on the second click it enables repeat one, and on the third click it disables both.

[nloomans]

Update: After reading the source code I discovered there was a right click option on the repeat icon. The option menu really needs to be more discoverable

[danirabbit]

Closed in #188