Build playlist

[sam9525]

Related issue: #838

What I did

• Create “playlist view” buttons and “clean out playlist” button.
• Create buttons in the “right-click menu” that show "Delete from playlist" when “playlist view” button is toggled, and "Add to playlist" when it's not.
• While in playlist view, users can click the “playPlaylist” button to play the entire playlist.
• The playlist view button also works with other views to change the playlist view style.
• Add language translations for the playlist view, clean out playlist, add to playlist, and remove from playlist buttons.

Potential issues

• The playlist view sorts by video name instead of following the order in the .pls file.
• When the “playlist view” button is not toggled, the “playPlaylist” button will play all videos currently displayed in the gallery.

Thank you for maintaining this project.

[whyboris]

Thank you @sam9525 for the PR 🙇‍♂️ -- I've been busy but I'm finally intending to merge PRs this month 🤝 -- I'll look at yours soon!

If you feel like resolving the merge conflicts, please take a glance. Otherwise I'll merge this PR into a WIP branch, fix whatever I prefer myself, and merge that branch into main 👍 😁 👍

🙇‍♂️

[sam9525]

I have resolved the conflicts.

[whyboris]

Thank you @sam9525 -- I'll try to get to merging more PRs this and next week 😁 🚀