MB-Lab 1.7.8.9

Changes

• Taking out "HAIR" icon so that the hair section works. @Nautilusera (#390)
• Dev @animate1978 (#396)
• Fix #351 issues with saving and reloading toon girl @Upliner (#352)
• Fix #338 prevent wrong objects to be returned from … @Upliner (#340)
• Fix finalization for Toon girl @Upliner (#337)
• Added scalp mesh to hair engine @Upliner (#323)
• Use annotations for prop definitions @Upliner (#334)
• Bugs chasing in model creation @animate1978 (#332)
• Optimize calculate_disp_pixels for faster displacement calculation @Upliner (#329)
• Merge master branch into dev @animate1978 (#330)
• 1.7.8.50 is still in the code but this is 1.7.8.9