curve - added curve_type() to return the curve type
BPyModule & gen_library - works with text3d now, can also make new text3d through bpy.curves.new
Added Draw.Label() so scripts can draw can using freetype.
widgetwizard - use Draw.Label
made all libdata hashable - use the object type,name and lib for the hash.
added .tag to libdata so we can test if data's been processed without using dictionaries
added libdataseq.tag (write only) setting the tag flag (which can always be dirty)
