FlipBar, Moments and other fixes

[kThorsager]

Issues addressed by this PR

Closes #156
Fixed by adding warnings when pushing unstable releases. The warning outline why the release was unstable but does not stop the bar from being pushed. The release is then set as ETABS default fix fix.
Closes #232
Fixed by flipping the bar before ETABS gets the chance to. (but actually handling the asymmetric properties)
Residual issue is that asymmetric sections can't be mirrored in ETABS API, raised in #253
Closes #239
Closes #249
Closes #252

Test files

https://burohappold.sharepoint.com/:u:/s/BHoM/EQS3iMoVy-1NtG9g1powvwMBAHCMpXf9frWfX42K-OmwyQ?e=N9EnZI

Changelog

• Fixes unpredictable bar behaviour due to ETABS flipping them upon creation
• Adds warnings when pushing unstable Bar Releases
• Adds feature to push BarUniformlyDistributedLoad with moments
• Fixes pushing ExplicitSection
• Fixes Pushing Offsets with displacement along the X-axis

Additional comments

[IsakNaslundBh]

Genral looking great. Really good to have comments explaining why things are failing! A small comment on method name of flip bar and some pre-existing bug that needs fixing for explicit section.

Also added comment about the releases, to double check that the Etabs conventions and BHoM conventions are converted correctly.

And finally, still unchecked, is that the direction of especially Mz is correct.

[kThorsager]

Completely right @IsakNaslundBh , releases have been fixed (should that be logged somewhere?) and Explicit section is actually fixed now, and the bars orientation behaves

[IsakNaslundBh]

LGTM now! general nice improvements and good to get explicit error messaging of what is malfunctioning (when it does)