[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.
b3ba98fafe