Start file/item/image/folder selector at current selection

[manthey]

Use the Girder browser widget option to start selections at current values, highlighting the selected item associated with the item/file/image.

[BryonLewis]

Almost there with default types and some sensible switching between single files and the regEx expressions where they will default to the same folder when swapping.

Need to add in some testing and do some cleanup to the minor issues.

scaledResource.mp4

[manthey]

@BryonLewis Either as part of this or as a separate PR, I'd like to use the paging interface for the browser widget. I know we'll have cases with thousands of items in a folder.

[BryonLewis]

@manthey okay I'm adding it in, the basics look like they work as far as the pagination and going to the right page. Having some issues with the scrolling (could be to the way I initialize, I'll look into it further).

[BryonLewis]

Looks like I may need to fix some minor things in girder for this to work:

• It looks like the default for /item/{id}/position sorts by 'lowerName' but the display seems to be always by 'name'. This can cause issues with pagination
• I don't know if scroll behavior changed in the browsers but there was an addition that was done to incrementally scroll which doesn't seem to be needed anymore in either firefox or chrome. I'll do a bit more testing with this.
• Only other thing is finding a better way to do the injecting to do the initial highlighting in regEx mode.

Video below has the girder Browser Widget changes in there as well.