Blender Git Loki

* Initial support for dynamically-sized Griddata from subsurf.

CCGSubsurf internally already fully supports vertdata of any size. This commit basically extends that support to all the code using the output of subsurf (with dm->getGridData).

For now, two types of grid data are set up: coords+normals with masks, and coords+normals without masks. More types to come.

For future reference, emacs find/replace regexps used to make some of the changes:

(data|subgrid|grid|edgeData|faceGridData)[(.*?)].(co|no|mask)
GRIDELEM_,(upcase 3)_AT(1, 2, gridkey)

&(diffGrid|gridA|gridB|faceGridData|gridData[i]|lowGridData[i])[(.*?)]
GRIDELEM_AT(1, 2, gridkey)

(vi.grid|vd|a|b|vda|vdb)->(co|no|mask)
GRIDELEM_,(upcase 2)(1, gridkey)