stubs: added stubstest, classmethod/staticmethod handling, better pymel.all handling
stubs: added stubstest, classmethod/staticmethod handling, better pymel.all handling

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