Composition GUIs, Type Hints and Intersphinx Updates

[chrizzFTD]

• For PrimComposition:
  • Add "Expanded Prim Index" and "Inert Nodes" options
  • Colorized and add search capability to the Nodes Text Browser
  • Add stats summary to the upper right corner of the widget
  • Fix Tree widget to have rows added to their correct parents
• Add relocates color to Layer Contents Browser
• Theme updates for:
  • No right bar navigation
  • Reduced multiline-signature spacing
• Intersphinx updates for OpenUSD and Networkx
• Updated images for prim and layerstack composition views
• Added sphinx glossary
• Fail spawn_many with a clear message when the current edit target can not find a spec on a parent path to set model kind

[codecov]

Codecov Report

Attention: Patch coverage is 97.69231% with 3 lines in your changes missing coverage. Please review.

Project coverage is 92.86%. Comparing base (3e519a5) to head (2ea14ca).
Report is 1 commits behind head on develop.

Files with missing lines	Patch %	Lines
grill/views/description.py	96.42%	3 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop      #43      +/-   ##
===========================================
+ Coverage    92.73%   92.86%   +0.12%     
===========================================
  Files           17       17              
  Lines         3717     3796      +79     
===========================================
+ Hits          3447     3525      +78     
- Misses         270      271       +1     

Files with missing lines	Coverage Δ
grill/cook/__init__.py	100.00% <100.00%> (ø)
grill/usd/__init__.py	100.00% <100.00%> (ø)
tests/test_cook.py	100.00% <100.00%> (ø)
tests/test_views.py	100.00% <100.00%> (ø)
grill/views/description.py	92.84% <96.42%> (+0.29%)	⬆️

... and 1 file with indirect coverage changes