[FEATURE] Click through models in a directory

[sdatkinson]

Is your feature request related to a problem? Please describe.
When I want to load a new model, I always have to pick it from the file browser, even if I've already picked a model from a direcotry with tons of models in it.

Describe the solution you'd like
The ability to click through models in a directory once you're in there. A pair of arrows to click would do the trick.

Describe alternatives you've considered
Can continue to use as-is.

Additional context
Requested by a user.

[jaredbehrens]

This is probably my number one feature requested feature now that we have single file captures. Previous/Next buttons should do the trick. Thanks for all of your efforts!

[dmt-hub]

Next/previous buttons - def no. 1 quality of life feature

[olilarkin]

see PR #242

[olilarkin]

this can be closed