* Add a command that creates multiple Arch Structure objects from a selected base, using each selected edge as an extrusion path. It creates one Arch Structure object from each edge. Therefore, the Arch Structure objects can then be individually edited if needed.
* Split the command Arch Structural System from Arch Structure. For backwards compatibility, the command Arch Structure will run the command Arch Structural System when the requirements for the Arch Structural System (Structure + Axis) are met.
* New widget for Tool selection: this enables the use of some Edges and not only entire Shapes - it makes possible to build Structures from a master Sketch.
* Add option BasePerpendicularToTool : option to create multiple Structures with a single Base (profile), along different Tools (paths). A copy of the profile is created and aligned perpendicular to the path at it start point.
This can already be done with multiple Draft Clones attached using the "NormalToEdge" mode, but this new option will make it more straightforward and with less objects in the document.
* Group properties related to the Tool in a group "Extrusion Path"
* Add a readonly property ComputedLength (it will be needed in BIM schedules)
- group all `base, placement = self.rebase(baseface)` in one place
- group all normal calculations in one place
- fix placement of tool (bug introduced by my previous PR)
- allow multiple faces when face is created by FaceMaker
- remove unused code: if `len(obj.Base.Shape.Edges) == 1` is true, then there is a Wire and `obj.Base.Shape.Wires` should be also truthy
See: https://forum.freecadweb.org/viewtopic.php?f=23&t=43228
It fixes the following issue:
Allow the use of sketches for Structure which follow a Tool. Currently, sketches are only accepted as structure Base when there is no Tool set. If I select the sketch and press the Structure button, the structure is computed correctly. But when I set the Tool property, the message "Structure has no solid" is reported and the Structure is not updated.
