This operator converts any stroke of gpencil with a center line into a stroke with the perimeter.
It's possible to assign the active material, keep current or create a new material for all perimeters.
The conversion is only done for strokes with a material using `Stroke`. Only `Fill` strokes are not converted.
Known issues: As the perimter has not boolean implementation, some perimeters can be overlaped. This could be solved in the future when a new 2D boolean library will be developed.
Reviewed By: mendio, pepeland, frogstomp
Differential Revision: https://developer.blender.org/D15664
aa7b2f1dd9