Buttons to trigger filament change

[davejlong]

Is your feature request related to a problem? Please describe.
No current problems

Describe the solution you'd like
I was looking for a feature to be able to click a button and trigger the filament change G-CODE commands to the printer (M600 for Marlin firmware). If it were built into the plugin, I'd expect to see a popup window asking what filament is being loaded in to keep track.

Describe alternatives you've considered
I initially was looking for a way to just add quick buttons to OctoPrint to send commonly used G-CODE's to the printer like this one.

Additional context

[badnetmask]

I am interested in this as well, so I am adding +1 and following.