[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.
Depending on the input mode, either `Growth` or `Angle` is used to create
a conical or flat spiral. The respective other can easily be calculated
to give consistent view. This is already done for the other properties,
e.g. `Height` is calculated from `Pitch` and `Turns`.
With this patch, the same is done for `Angle` and `Growth`.
- when a helix is defined in the growth mode it can have a pitch of zero
This commit fixes the resulting division by zero by directly setting the known turns
Introduce an enum to verify the axis depending on the used context.
* For helix no restriction is needed
* For Pad/Pocket the axis must not be parallel with the sketch plane
* For Revolve/Groove the axis must not be perpendicular with the sketch plane
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.)
Now that we have the feature that sweeps can have vertices as end or begin of a sweep, there is the need for the feature to move sections. For example vertices may only be the last section.
