Ability to search in Playlists when adding a song in AddToPlaylist Action

[deauthe]

need to have a way to search through the playlists when adding a song to a playlist rather than scrolling all the way down into my hUgE library

[teddywaweru]

not saying it's not possible, but the AddToPlaylist is a popup, while the search bar is also a popup. Best case of adding this feature(my opinion) is the ability to have a Vec returned for popups so that the two above can be combined when "/" is pressed. Might be a tedious task for a single use case.
I could work on it if there was a different way of achieving it, without significant code structure changes.

[deauthe]

made a PR for it
#784