Better local file component

[luiztauffer]

• [x] Uses ipyfilechooser, which improves the experience for browsing and reading local NWB files with Panel
• [x] Removes Local dir option, because it will be already covered by this new component
• [x] Fix dataset closed error for local files

[codecov[bot]]

Codecov Report

Merging #300 (4853f87) into master (b99aa49) will decrease coverage by 0.06%. The diff coverage is 50.00%.

@@            Coverage Diff             @@
##           master     #300      +/-   ##
==========================================
- Coverage   66.28%   66.22%   -0.06%     
==========================================
  Files          35       35              
  Lines        3470     3458      -12     
==========================================
- Hits         2300     2290      -10     
+ Misses       1170     1168       -2     

Flag	Coverage Δ
unittests	66.22% <50.00%> (-0.06%)	:arrow_down:

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
nwbwidgets/timeseries.py	58.66% <ø> (ø)
nwbwidgets/view.py	96.55% <ø> (ø)
nwbwidgets/panel.py	77.56% <43.47%> (-0.55%)	:arrow_down:
nwbwidgets/behavior.py	74.22% <100.00%> (+0.26%)	:arrow_up:

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[CodyCBakerPhD]

Looks and feels good!

I will note that I had to do a fresh install of the package to get some conflicts to resolve, otherwise ran into file access issues after a path had been selected

[bendichter]

cool!