More options in which way songs should be added to pared-down version of a playlist

[datguyducky]

I still need to add option to add songs starting from recently added (#16), but I also think Pare Down should have more options than that,for example:

• add every X songs to a playlist
• only by specific artists (probably get all artists in a playlist -> display them somehow -> get only songs by them)
• by specific genre/s