Data type for holding a shaping plan.
Shape plans contain information about how HarfBuzz will shape a particular text segment, based on the segment's properties and the capabilities in the font face in use.
Shape plans can be queried about how shaping will perform, given a set of specific input parameters (script, language, direction, features, etc.).
.g_type : UInt64
Returns the type id (GType) registered in GLib type system.