Jeffrey C. Ollie 743e547235 cli: "fancy" theme preview
This adds a "fancy" theme preview to the `+list-themes` CLI action.
By default, if the command is connected to a TTY, it will display the
fancy preview. If it is not connected to a TTY, or the user specifies
`--plain` on the command line, a simple list of themes will be printed
to stdout.

While in the preview `F1` or `?` will show a help screen.
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