Update actions in channel view

[hieblmi]

I am thinking of editing capabilities in the channel view. So far lntop is a read-only viewer but it could be very convenient to have actions like 'updating channel params' or 'closing channels' etc.. By clicking 'Enter' on the different fields a input/confirm dialog would pop-up:

[hieblmi]

@rkfg do you think that editing functionality would be in the right place in a *top util or should lntop only have displaying capabilities?

[rkfg]

On one hand, the original top program is read only. On the other hand, the more popular htop allows to do a lot of changes like process and I/O priority, killing processes etc. So I think historically *top can be more than viewers. However, I'd suggest not allowing any changes by default unless a config option for that is enabled so that lntop is a viewer out of the box but if the user wants so it can also change parameters. Just so that there's no accidental money loss due to closed channel or dropped fees.

[hieblmi]

Very good suggestion to disable actions by default via config flag. Just wanted to see if functionality like that would get support here before adding it. Just need time to start working on it. Updating fees directly in lntop would save me so much time.