Pass through DXF import options for better geometry creation

[ccaprani]

For curves and other complex geometries, the default options in cad2shapely may not suffice. This PR exposes the optional inputs to the sectionproperties user in from_dxf.

A few minor tweaks to the documentation for correctness, and black autoformatting removed a few parentheses.

[ccaprani]

The Lint checks are failing on files I haven't edited ;-)

would reformat /home/runner/work/section-properties/section-properties/examples/01-advanced/05_trapz_approximation.py
would reformat /home/runner/work/section-properties/section-properties/sectionproperties/analysis/fea.py
would reformat /home/runner/work/section-properties/section-properties/sectionproperties/pre/library/steel_sections.py 
would reformat /home/runner/work/section-properties/section-properties/sectionproperties/pre/pre.py 
would reformat /home/runner/work/section-properties/section-properties/sectionproperties/analysis/section.py 
would reformat /home/runner/work/section-properties/section-properties/sectionproperties/tests/test_concrete_sections.py

[robbievanleeuwen]

Thanks @ccaprani, this looks good!

I'm going to look to merge this into the hypermodern branch so that it can be better integrated into the upcoming v3.0 release. Once I finish the updated docs I'll resolve the conflicts :)

[robbievanleeuwen]

Moved to #292