Search through help menu

[23b00t]

I would love to have a / command in the help menu, to quickly find what I'm looking for. Although I use termusic for a while now and love it very much ❤️ I quiet often use the help for commands I not use regularly. So it's not a big deal to look into the sections, but I'm not good at processing visual input and to just have a search would be very nice.

[hasezoey]

Help widget improvements are already listed in #692, including searchable help.

[23b00t]

thx