CLI: Use unicode chars in progress reporting
CLI: Use unicode chars in progress reporting

There are unicode full blocks and 1/8ths horizontal parts of a block, so
we can use this for the progress bar to get a lot more fidelity.

Closes: #2449
Approved by: alexlarsson

matthiasclasen/flatpak,flatpak/flatpak,flatpak/flatpak,flatpak/flatpak,matthiasclasen/flatpak,matthiasclasen/flatpak,matthiasclasen/flatpak,flatpak/flatpak,matthiasclasen/flatpak,flatpak/flatpak