3x380V

I made sure clang-format will left your work untouched after enabled on App, fixed some else after returns, optimized few functions. `git difftool -y core_LCS2_..core_LCS2 --no-merges` could be used to...

@PaddleStroke, I cannot attach patch (this is [known issue](https://docs.github.com/en/get-started/writing-on-github/working-with-advanced-formatting/attaching-files)), so you need a little work (or you can donwload it as text file [core_LCS2.txt](https://github.com/user-attachments/files/17918762/core_LCS2.txt)) Pull my branch `core_LCS2_` from https://github.com/3x380V/FreeCAD/tree/core_LCS2_...

> Then there's clang-format which I have not done. And which is not perfect as a result of the rebase. That's why I'm proposing you just replace commits with those...

`git diff core_LCS2..core_LCS2_` is now empty, so it is single checked, but I consider it bullet proof enough. This version was compiled and tested using `FreeCADCmd -t 0` with all...

Yes. Otherwise I cannot read diffs carefully enough and need holidays :)

@PaddleStroke, glad it worked. Do you want any help with the rest of changes once this PR is sorted out?

How does just added [Assembly: Simulation implementation](https://github.com/FreeCAD/FreeCAD/pull/18126/commits/63f24c308144051aec2c292b2bd5902590634aaf) relate to this PR? Was it in intentional?

@PaddleStroke, I wonder why you didn't raise your voice earlier. Those commits were in preparation for a long time, but only few people were objecting. Reverting is not an option,...

@PaddleStroke, #16077 was opened on Aug 26, 3 months ago.

@PaddleStroke, for sure it is not PR that was merged, it is the one which is showing what is about to happen, that's the point. Also the idea of reformatting...