add :transform attrib matrix converter, add support for instancing, add hsb versions for gradients, add line-label decorator & comp-decorators, update adapter metadata handling & rename keys
add :transform attrib matrix converter, add support for instancing, add hsb versions for gradients, add line-label decorator & comp-decorators, update adapter metadata handling & rename keys

thi-ng/geom,JDReutt/geom,thi-ng/geom