Reorder declarations in internaltypes.h.
Reorder declarations in internaltypes.h.

hsorby/libcellml,nickerso/libcellml,cellml/libcellml,nickerso/libcellml,cellml/libcellml,nickerso/libcellml,hsorby/libcellml,cellml/libcellml,hsorby/libcellml,cellml/libcellml,nickerso/libcellml,hsorby/libcellml