Modify the auxiliary spine to be a true helix, resulting in a much
smoother linear extrusion when a twist angle is applied. This also
corrects a bug in the scaling during linear extrusion, where non-uniform
scaling was not handled correctly.
at the moment the sorting is confusing, the sorting in the menu differs from the toolbars and some features even belong in the menu to another category than in the toolbars and one feature has not yet a toolbar entry
This PR implements a uniform sorting for the menu and toolbar and adds the missing toolbar icon
- this is necessary to perform electrodynamics simulations. Since the typical values are in the range of 1e6 S/m, we need the new units kS and MS
- since this is for simulations, also add electrical conductivity to the FEM material cards
- the property has the name "Element order" thus the dialog should use the same name to avoid confusions
-also uniform naming for the element dimension and remove the redundant "Mesh" (is already in the UI groupBox heading
- Gmsh has since a while 2 new mesh algorithms
- on the other hand the two algorithms ""Frontal Delaunay" and "Frontal Hex" are deprecated and not listed anymore in the docs: https://gmsh.info/doc/texinfo/gmsh.html#index-Mesh_002eAlgorithm3D
and indeed all attempts with these 2 algorithms fail