Degloballing

[0Hughman0]

Trying to reduce dependence on use of the global env to only places where it's strictly necessary.

[codecov]

Codecov Report

Attention: Patch coverage is 80.89888% with 17 lines in your changes missing coverage. Please review.

Project coverage is 67.40%. Comparing base (6b56630) to head (9226444).
Report is 7 commits behind head on 0.3.0-pre.

Files	Patch %	Lines
cassini/ext/ipygui/components.py	0.00%	9 Missing ⚠️
cassini/ext/ipygui/gui.py	0.00%	5 Missing ⚠️
cassini/core.py	93.33%	2 Missing ⚠️
cassini/sharing.py	97.67%	1 Missing ⚠️

Additional details and impacted files

@@              Coverage Diff              @@
##           0.3.0-pre     #144      +/-   ##
=============================================
+ Coverage      66.94%   67.40%   +0.45%     
=============================================
  Files             21       21              
  Lines           1688     1681       -7     
=============================================
+ Hits            1130     1133       +3     
+ Misses           558      548      -10     

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