Add settings.cpp to Makefile.
Add settings.cpp to Makefile.

Ultimaker/CuraEngine,be3d/CuraEngine,foosel/CuraEngine,patrick3coffee/CuraTinyG,be3d/CuraEngine,fxtentacle/CuraEngine,phonyphonecall/CuraEngine,alex1818/CuraEngine,pratikshashroff/pcura,jacobdai/CuraEngine-1,alex1818/CuraEngine,jacobdai/CuraEngine-1,pratikshashroff/pcura,Jwis921/PersonalCuraEngine,Skeen/CuraJS-Engine,daid/CuraCutEngine,totalretribution/CuraEngine,patrick3coffee/CuraTinyG,derekhe/CuraEngine,be3d/CuraEngine,uus169/CuraEngine,markwal/CuraEngine,electrocbd/CuraEngine,foosel/CuraEngine,ROBO3D/CuraEngine,daid/CuraCutEngine,markwal/CuraEngine,Jwis921/PersonalCuraEngine,jacobdai/CuraEngine-1,Intrinsically-Sublime/CuraEngine,alex1818/CuraEngine,uus169/CuraEngine,Skeen/CuraJS-Engine,patrick3coffee/CuraTinyG,electrocbd/CuraEngine,Skeen/CuraJS-Engine,mspark93/CuraEngine,robotustra/curax,alephobjects/CuraEngine,ROBO3D/CuraEngine,mspark93/CuraEngine,Intrinsically-Sublime/CuraEngine,phonyphonecall/CuraEngine,alephobjects/CuraEngine,totalretribution/CuraEngine,foosel/CuraEngine,totalretribution/CuraEngine,uus169/CuraEngine,ROBO3D/CuraEngine,robotustra/curax,mspark93/CuraEngine,phonyphonecall/CuraEngine,robotustra/curax,fxtentacle/CuraEngine,derekhe/CuraEngine,Intrinsically-Sublime/CuraEngine,derekhe/CuraEngine,electrocbd/CuraEngine,Jwis921/PersonalCuraEngine,alephobjects/CuraEngine,fxtentacle/CuraEngine,pratikshashroff/pcura,Ultimaker/CuraEngine,markwal/CuraEngine