[Feature request] Allow text buttons in the panel to remain as icons when the panel is small

[bobcat141]

The "Workspaces", "Launcher" and "Applications" buttons on the panel currently are shown as icons when the panel is big, and as text when the panel is small:

It would be nice if we could set them to be in icon mode or text mode manually, so they would retain their icon form even when the panel is small. This would expand customization options and allow the user to do something like this (sketch made on GIMP):

[git-f0x]

This is planned once per-applet settings are implemented. Until then, you can use a configuration file to achieve this. Create a file called configs in ~/.config/cosmic/com.system76.CosmicPanelButton/v1/, with the following contents:

{
    "Panel": (force_presentation: Some(Icon))
}

[bobcat141]

That works great!