571 feature request add basis for complex steel shapes

[GerjanDorgelo]

Description

Add basis for complex steel shapes, such as CHS, strips, and I-profiles. The idea is to build steel shapes from basic elemental shapes. The code has been set up like the reinforced concrete is: which is a rectangle (concrete) with inner circles (rebar). Steel elements such as I-profiles consist of 3 rectangles and 4 radii. A tube is just a single element. Using this method, it's rather easy to build your own shapes.

Also did some optimizations for speed regarding curves fix.

Fixes #571

Type of change

Please delete options that are not relevant.

• New feature (non-breaking change which adds functionality)
• This change requires a documentation update

Checklist:

• I have added tests that prove my fix is effective or that my feature works
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• New and existing unit tests pass locally with my changes

[github-actions]

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