rdis.function_to_png removed. added lua object rdg: rdis.rdg(uint64 address), rdg:save_png(filename), rdg:node_by_coords(x,y), rdg:ins_by_coords(x,y)
remove rdis.function_to_png, added rdis.rdg(uint64) which returns a rdg object of that function, with rdg:save_png, rdg:node_by_coords, rdg:ins_by_coords and rdg:highlight_ins