Feature: Provide keyboard help while playing

[forthrin]

https://github.com/libsidplayfp/sidplayfp/blob/master/src/menu.cpp#L55

←/→  Previous/Next  1-9  Toggle voices  h    Help
↓/↑  Standard/Fast  a-d  Toggle sample  q    Quit
p    Pause          f    Toggle filter

Notices and accompanied suggestions:

1. Move toggle sample to a-d to free up q for quit. Fits snugly with related f for toggle filter.
2. Keep esc as an implicit and expected way to quit.

[drfiemost]

Not sure if we want to change keys, it might upset users.
Also I wonder if those unicode chars will show correctly on Windows...

[forthrin]

True. Sometimes it's done anyway, and if it makes sense, people will appreciate it in the long run. Apple changed some keys in macOS 26. A few days and you're on board. Anyway, let's contemplate that one a bit.

Does anyone use Windows except when forced by compliance regulations at work? And if they haven't gotten basic Unicode right after twenty years, then that's another nail to keep the thousands of others company.