Add optional customStyle property to 'Command' object interface

[jerryzhou196]

Currently, some of the dropdown options within the Command Line Interface could benefit greatly from visual styling - especially the Theme... and Font Family.... dropdown options. By implementing an optional customStyle property of type string to the Command interface, we could easily style certain dropdown options by passing in CSS strings when we are pushing each Command object into it's respective CommandsSubgroup. Here are some examples I made with this new customStyle property:

This might make the theme selection more intuitive. I will admit it is kind of an eyesore with certain theme combinations.

Here, each font is rendered accordingly instead of having to cycle through each one to preview it.

This property could further be used within the funbox command dropdown and such. It lays a framework for future customization within the command line interface.

I'm unsure if this violates the minimalist philosophy behind the command line interface. I just found it easier to be able to visually preview the colors instead of dragging my mouse through the options, and wanted to give my two cents. 🤠