Hide .quilt directory

[fiskus]

Added preferences.blocks.browser.hidden property to show hidden files. Probably, it is confusing, and is better to use showHidden. Or maybe it's ok in context of entire config where true shows and false hides

Also, memoized Listing in PackageTree

[codecov]

Codecov Report

Merging #3634 (9f5d111) into master (4933ee3) will decrease coverage by 0.02%.
The diff coverage is 9.83%.

@@            Coverage Diff             @@
##           master    #3634      +/-   ##
==========================================
- Coverage   36.14%   36.12%   -0.02%     
==========================================
  Files         676      676              
  Lines       29673    29701      +28     
  Branches     4321     4328       +7     
==========================================
+ Hits        10724    10729       +5     
- Misses      17812    17835      +23     
  Partials     1137     1137              

Flag	Coverage Δ
api-python	91.35% <ø> (ø)
catalog	9.84% <9.83%> (+0.01%)	⬆️
lambda	86.03% <ø> (ø)

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

Files Changed	Coverage Δ
catalog/app/containers/Bucket/Dir.tsx	0.00% <0.00%> (ø)
catalog/app/containers/Bucket/Listing.tsx	0.00% <0.00%> (ø)
...p/containers/Bucket/PackageDialog/S3FilePicker.tsx	0.00% <0.00%> (ø)
.../app/containers/Bucket/PackageTree/PackageTree.tsx	0.00% <0.00%> (ø)
catalog/app/utils/BucketPreferences/index.ts	0.00% <0.00%> (ø)
...g/app/utils/BucketPreferences/BucketPreferences.ts	71.60% <85.71%> (+0.93%)	⬆️

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[nl0]

i think this should be a catalog-level option, not bucket-level. @akarve wdyt?