Generic outer level progress bar control

[CodyCBakerPhD]

@garrettmflynn You should be able to use this draft branch to try out the approach for the Inspector

Right now there would just be one progress bar tracking the number of files left to be scanned

[garrettmflynn]

Yep this works great!

[garrettmflynn]

This PR is no longer functional with the GUIDE and requires #443 to be merged in.

[CodyCBakerPhD]

The GUIDE specifically doesn't utilize this particular route, but it might still be useful

Or are you saying something overlooked here actually causes a problem with the GUIDE?

[garrettmflynn]

There isn't a corresponding PR on the GUIDE that works solely for this. NeurodataWithoutBorders/nwb-guide#676 has been refactored to work with #443, but will fail when using this PR alone.

[CodyCBakerPhD]

@garrettmflynn Yes, I know. GUIDE specifically needs the next step of this chain

But is there an actual problem with the actual part of the code in the PR?

[garrettmflynn]

Ah sure, this implementation is fine.

However you'd like to coordinate the merge is fine with me. Feel free to start here!