Some users would like to use a different system monitor other than the
current GNOME System Monitor app. Add a new setting that can be used to
specify a custom command for a system monitor app, falling back to the
default when none is provided (or on error).
Fixes #96
What I tested
[X] Verified no regressions to existing functionality.
[X] Tested on the following Gnome Shell versions: 47
Some users would like to use a different system monitor other than the current GNOME System Monitor app. Add a new setting that can be used to specify a custom command for a system monitor app, falling back to the default when none is provided (or on error).
Fixes #96
What I tested
Screenshots
This change is