[REQUEST] Allow sending SIGSTOP/SIGCONT signals to processes

I'm often using htop to pause or resume a process / tree of processes. It seems that Bashtop can't d that right now.

**Describe the solution you'd like**

It'd be nice to have a STOP/CONT option - also being able to apply the same to all child processes would be fabulous. For example if I want to pause Blender rendering in one instance, I need to hunt down all child processes, which is not easy, and if I'm running another Blender instance that I don't want to pause - it's very difficult.

This may not be the most needed function, but I'd like to know if others would appreciate it too.