added all required names for the new DSDA UDMF properties to the list of names.

src/namedef_custom.h

@@ -865,4 +865,28 @@ xx(skew_bottom)
 xx(skew_middle)
 xx(skew_top)
 
+xx(xscroll)
+xx(yscroll)
+xx(xscrolltop)
+xx(yscrolltop)
+xx(xscrollmid)
+xx(yscrollmid)
+xx(xscrollbottom)
+xx(yscrollbottom)
+xx(xscrollfloor)
+xx(yscrollfloor)
+xx(scrollfloormode)
+xx(xscrollceiling)
+xx(yscrollceiling)
+xx(scrollceilingmode)
+xx(xthrust)
+xx(ythrust)
+xx(thrustgroup)
+xx(thrustlocation)
+xx(colormap)
+xx(skyfloor)
+xx(skyceiling)
+xx(frictionfactor)
+xx(movefactor)
+
 xx(Corona)