Type Fragment missing a static constructor

[plafosse]

Version and Platform (required):

• Binary Ninja Version: dev

All other type objects have a staticmethod for constructing their types. TypeFragments is missing one.

	@staticmethod
	def structure(
	    members: Optional[MembersType] = None, packed: _bool = False,
	    type: StructureVariant = StructureVariant.StructStructureType
	) -> 'StructureType':
		return StructureType.create(members, packed, type)