cm3us: m3u file → cmus playlist

Convert playlists from android m3u with hardcoded paths to cmus playlists with different hardcoded paths.

So no editing from cmus which I would seldom do anyway

1. On cmus start call cm3us (somehow)
2. For every playlist in ~/Documents/Sync/Playlists/, replace '/storage/emulated/0/Music/' (android library dir) with '/home/archie/Music/MusicLibrary/' (linux library dir)
3. Save output to ~/.config/cmus/playlists

sed 'sstorage/emulated/0/Musichome/archie/Music/MusicLibrary/' for every playlist