system: added proper hash function for FileReference
system: added proper hash function for FileReference

juggernate/pymel,AtonLerin/pymel,david-lassonde-adsk/pymel,leonsooi/pymel,shrtcww/pymel,assumptionsoup/pymel,leonsooi/pymel,AtonLerin/pymel,juggernate/pymel,assumptionsoup/pymel,david-lassonde-adsk/pymel,shrtcww/pymel