Edit Target, Stage Stats, Doc Updates

[chrizzFTD]

• Minimum python version is Python-3.9

• Created assets use UsdUISceneGraphPrimAPI display attribute instead of a custom label attribute.

• Added StageStats view.

• Added Set as Edit Target menu on Prim Composition arcs' tree.

• Documented Layer Content Browser.

[codecov[bot]]

Codecov Report

Merging #28 (1679d69) into main (90c1786) will increase coverage by 0.22%. The diff coverage is 93.75%.

@@            Coverage Diff             @@
##             main      #28      +/-   ##
==========================================
+ Coverage   94.29%   94.51%   +0.22%     
==========================================
  Files          15       16       +1     
  Lines        2242     2335      +93     
==========================================
+ Hits         2114     2207      +93     
  Misses        128      128              

Impacted Files	Coverage Δ
grill/views/description.py	89.30% <72.41%> (+0.17%)	:arrow_up:
grill/views/stats.py	97.50% <97.50%> (ø)
grill/cook/__init__.py	100.00% <100.00%> (ø)
grill/usd/__init__.py	100.00% <100.00%> (ø)
grill/views/_attributes.py	96.00% <100.00%> (+0.05%)	:arrow_up:
grill/views/_core.py	100.00% <100.00%> (ø)
grill/views/_qt.py	100.00% <100.00%> (ø)
grill/views/create.py	90.47% <100.00%> (+0.95%)	:arrow_up:
grill/views/sheets.py	91.60% <100.00%> (+0.09%)	:arrow_up:
tests/test_views.py	99.63% <100.00%> (+<0.01%)	:arrow_up:
... and 8 more

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