Changed the defaults for feet to be the midpoint, rather than the upper-left, if not otherwise specified; it seems that upper-left is a poor default for almost anything; platformers would want the bottom middle, top-downs would want the xy middle.  This brings non-solid objects more in line with what we already do for solid objects (which is the bottom mid, rather than the xy middle).  I've had to manually specify feet for such objects dozens of times now, and IIRC, it's universally been to what I just made the default, just to allow non-solid objects to correctly flip themselves around the center of their image when their facing is changed.