Please add option to apply filament change to all plates

[rafal-molotkiewicz]

Is your feature request related to a problem? Please describe.
I have 6 models that all need a couple of filament changes on the same heights. I can only fit two models per plate. So I need to go thorough all the filament change setup 3 times, and if I'll miss by a layer, colors on the finished piece won't mach exactly.

Describe the solution you'd like
A button to copy custom changes to other plates, next to or below the "Discard custom changes" button. Desired placement shown on the screenshot at the bottom.

Describe how it would work
After clicking it, there would be a drop-down with list of plates and "all plates" option. If the destination plate already has custom filament changes, add "Do you want to keep filament changes on destination plate? [Yes][No][Abort]" message box. Then, just add filament changes with the same colors and layers as on the source plate, removing ones that was already there if applicable.

Describe alternatives you've considered
An option to lock the filament changes to all plates from the beginning - but I found it to be less useful, as I would probably forget the lock and only remember about it when I already set up one plate.

Additional context