add hs
Merge branch 'master' of git@github.com:spinos/aphid

Conflicts:
	shared/HDataset.cpp
	shared/HDataset.h
	shared/HDocument.cpp
	shared/HDocument.h
	shared/HGroup.cpp
	shared/HObject.cpp
	shared/HObject.h
sep add and write
load scene
mesh uv io; todo feather io