allow changing the bell sound (pick a different one from Notifications)
By default, Termius uses the system notification sound for the terminal's audible bell.
I have some beeps that are much better suited for a terminal bell, but won't do it as notification sound for all the other applications (my perfect beep is a single sound, plus it's much shorter and less loud compared to a proper notification).
Problem is, there's no way to change the bell sound!
There appears to be some standard API, as several applications have notification options and they instantly show anything I put in the phone's "Notifications" directory, so I guess this should be trivial to implement using that API.