Fix Julia sysimage creation

[soininen]

This PR resurrects Julia sysimage creation.

Accompanying PRs:
spine-tools/spine-engine#111
spine-tools/Spine-Toolbox#2246

Fixes spine-tools/Spine-Toolbox#1225

Checklist before merging

• Documentation (also in Toolbox repo) is up-to-date
• Release notes in Toolbox repo have been updated
• Unit tests have been added/updated accordingly
• Code has been formatted by black
• Unit tests pass

[soininen]

@manuelma I think I got the sysimage stuff working but I would appreciate it a lot if you could review the changes and perhaps test if everything is working as expected. Especially, the Julia code in options_widgets.py should be checked - I am unsure if there is nowadays better ways available in PackageCompiler to create the sysimage.

[codecov-commenter]

Codecov Report

Patch coverage: 27.27% and no project coverage change.

Comparison is base (08f822b) 55.10% compared to head (dfe175e) 55.11%.
Report is 2 commits behind head on master.

❗ Current head dfe175e differs from pull request most recent head 5a13afd. Consider uploading reports for the commit 5a13afd to get more accurate results

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Additional details and impacted files

@@           Coverage Diff           @@
##           master     #152   +/-   ##
=======================================
  Coverage   55.10%   55.11%           
=======================================
  Files         192      192           
  Lines       17371    17376    +5     
  Branches     2849     2850    +1     
=======================================
+ Hits         9572     9576    +4     
- Misses       7304     7305    +1     
  Partials      495      495           

Files Changed	Coverage Δ
spine_items/tool/widgets/options_widgets.py	25.51% <16.66%> (+0.41%)	⬆️
spine_items/tool/tool_instance.py	44.01% <25.00%> (-0.16%)	⬇️
spine_items/utils.py	64.64% <100.00%> (+0.72%)	⬆️

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[manuelma]

@manuelma I think I got the sysimage stuff working but I would appreciate it a lot if you could review the changes and perhaps test if everything is working as expected. Especially, the Julia code in options_widgets.py should be checked - I am unsure if there is nowadays better ways available in PackageCompiler to create the sysimage.

Looks good @soininen - I inspected the code and made a couple of comments - only one of them is a suggestion for a change. Maybe with more time I can test it and see how it works in reality, but my feeling is it should be close enough.

[soininen]

@manuelma Thanks a lot for the review! I think we're good to go with this PR.