Added combing_retract_before_outer_wall setting.
Added combing_retract_before_outer_wall setting.

This boolean setting controls whether travel moves to the first point in an
outer wall will always involve a retraction. IMHO, forcing a retraction has
two benefits:

1 - avoids taking the ooze that would occur during the travel to the outer
surface.

2 - the slight pause when un-retracting could help reduce any ripples
introduced by the rapid movement hot-end movement.

ynotstartups/Wanhao,ynotstartups/Wanhao,hmflash/Cura,hmflash/Cura,Curahelper/Cura,fieldOfView/Cura,fieldOfView/Cura,Curahelper/Cura