Allow changing settings

[fujiapple852]

The settings dialog is currently display only. It would be useful to allow some settings to be changed at runtime.

Note that any settings which influence the behaviour of the tracing algorithm (I.e the protocol) are unlikely to make sense to change on the fly and would require a backend restart anyway.

There are several settings which can be changed at runtime today via dedicated keyboard bindings.

What would the ux look like for updating config and how would that tie into existing parameter validation?