Progress bar cursor and layer progress

[e77]

If you do end up looking at temperature plotting or similar, it would be really cool if you could display an old school cursor on the progress bar

I've been using terminals for decades on servers and mainframes, and many processes use a text based progress bar
that have a spinning cursor at the progress point to give it that real terminal feel. (repeat the characters | - / \ )

Current layer progress would also be a useful addition