Misc tweaks to processInsetsAsGroups().
Misc tweaks to processInsetsAsGroups().

Highlights are:

Output all level 1 outer wall insets together (was doing 1 with the outer wall and any others later).

Should no longer need to output remaining outer walls or level 1 insets (there shouldn't be any remaining).

ROBO3D/CuraEngine,Ultimaker/CuraEngine,alephobjects/CuraEngine,ROBO3D/CuraEngine,ROBO3D/CuraEngine,Ultimaker/CuraEngine,alephobjects/CuraEngine,alephobjects/CuraEngine