With these changes, one face per solid can be added as either the first
"profile" or subsequent sections in loft and pipe.
This commit depends on `App::PropertyXLinkSubList` preserving the order in which
sections are added.
A minor change this also adds is that when a solid's face is selected that face
is mentioned in the fields instead of the solid (eg `Box:Face1` instead of
`Box`).
-Rename Sketchbased to ProfileBased to show new behavior
-Adopt ProfileBased to make the relevant helper functions work with faces too
-Adopt features for unified use of helper functions
-Adopt commands to allow face selection
