Core: Added doxygen defgroup for datastructures. (And code format of data.h)
Core: Added doxygen defgroup for datastructures. (And code format of data.h)

Sparkier/inviwo,Sparkier/inviwo,inviwo/inviwo,inviwo/inviwo,Sparkier/inviwo,inviwo/inviwo,Sparkier/inviwo,Sparkier/inviwo,inviwo/inviwo,inviwo/inviwo,inviwo/inviwo