*added legacy option for iemgui objects. Starting pd-l2ork with -lega…

…cy flag positions iemgui objects in their old, vertically inconsistent locations for the sake of retaining complete backwards compatibility.

*added sys_legacy global for inclusion of other potential legacy breakages that may develop later.

change alarm bell kludge used to separate messages to the GUI to a "unit separator" kludge. Still bad, but a little less bad

make key/keyup/keyname all suppress autorepeated events. We may need to revisit this later and possibly add a flag to toggle autorepeat in these objects