3D View - Sculpt - Sculpt header - Move Polyline Hide to Legacy (and add icon and document)

[Draise14]

Another act-once operator added as legacy...

Details

Sculpt: Polyline hide operator

This PR adds a polyline hide operator for sculpt mode as well as the
necessary generic callback code to allow using this gesture in other
selection tools.

Added features include:

• Polyline Hide operator
• WM_gesture_polyline_* callback functions for other operators
• Status bar text while using the polyline modal
• Common Gesture Polyline keymap for usage with the modal

Unlike the Box Hide and Lasso Hide operators, the Polyline Hide
operator does not provide a simple shortcut to click and show all
hidden elements in a mesh. This is because the existing operators
operate on a click-drag action while the new operator is invoked by
just a click.

Design Task: #119353

Pull Request: #119483

[ReinerBforartists]

Is already in Legacy, but misses the icons

[ReinerBforartists]

Documenting

[ReinerBforartists]

Done