* [PartDesign] Still a helix fix
If we don't break the helix path at each turns we get a vaild path for
MakePipe (solid) even with an angle.
* Decrease helix tests requirements
* PartDesign: Improve orientation behavior for conical helices
As identified in the forum
https://forum.freecadweb.org/viewtopic.php?f=3&t=65136
The Freenet orientation mode does not give expected results for helices with cone angle.
By using an auxiliary helix that is axially offset it is guaranteed that the orientation frame
is always consistent with a cylindrical coordinate system.
Results will be the same as before when cone angle is 0.
[PD]: Fix helix property visibility/writeability
* Hide irrelevant and internal helix properties
- The `HasBeenEdited` property is only used internally to check whether to
fill certain other parameters with initial values. So there is no need
show it in the property grid at all.
- The `Outside` property is only used in the subtractive helix and thus
hidden for the additive helix.
* Make derived helix properties read-only
Depending on the input mode, some properties are primary input, others
are derived. Prior to this change, also the derived properties have been
writable but their values are ignored and overwritten on the next
recompute. Now, when changing the input mode, only the primary input
props are writable.
* Reorder some helix properties
This change puts the reference axis and input mode at the top to become
more prominent. Only "Base" and "Axis" are higher in the list for
consistency with the other axis-based features.
Helices that become smaller with every turn are geometrically perfectly valid. Therefore we cannot forbid this.
(For example when creating a helix from a face you often cannot move it so that you can apply a positive growth.)
- Helix: the property Turns has the App::PropertyFloatConstraint thus also the pointer to it must have the same property
- LinearPattern and Helix: make constraints static class member (forgot this in commit 3704ad68)
- Draft: make the constraint const
- PolarPattern and LinearPattern assure that the header file is loaded at last to avoid potential troubles
These features, based on the code for the Pipe class, allow the user
to simply create a helical sweep within PartDesign workbench.
Sample application is threads, springs, coils, augers, etc.
Also, remove needless requirement for positive cone angle on helixes.
Thanks to @bitacovir for helping with the icons
Thanks to @chennes for review
Thanks to @vosk for review
Thanks to @wwmayer for review
Enforce that links stay within scope for ProfileBased features
This also ensures that the Body itself is not used for creating features within
the body, causing a "Graph not a DAG" error.
