Refactored constraints

[adrianschneider94]

Refactored solver.py for better readability/maintainability.

[adam-urbanczyk]

I might be biased, but it is better to discuss PRs with 1K lines of diff before implementing.

[codecov]

Codecov Report

Attention: Patch coverage is 85.37234% with 55 lines in your changes missing coverage. Please review.

Project coverage is 95.11%. Comparing base (8c68faa) to head (ba236a8).

Files with missing lines	Patch %	Lines
cadquery/occ_impl/solver.py	84.82%	28 Missing and 23 partials ⚠️
cadquery/assembly.py	89.74%	2 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1828      +/-   ##
==========================================
- Coverage   95.54%   95.11%   -0.44%     
==========================================
  Files          28       28              
  Lines        7319     7531     +212     
  Branches     1102     1126      +24     
==========================================
+ Hits         6993     7163     +170     
- Misses        195      216      +21     
- Partials      131      152      +21     

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[adrianschneider94]

I might be biased, but it is better to discuss PRs with 1K lines of diff before implementing.

Yes, probably 😄
I originally just wanted to add an UndirectedAxis constraint - but wanted to try out, how far Claude could carry a larger refactor - so I got going.
Just see if/what you like, functionally there is no change. The different constraints are just structured into classes so that everything belonging to one constraint is in one place.