Compile Time Changes

When dragging an ImageSnapper under an xclip with a companion, it is slow because the dirty2D flag is not propagated correctly (it should be dirty2D.pos). The changes below solve it.

xclipContent.cm:
    old: extend public void invalidate(Object obj)
    new: extend public void invalidate2D(Object obj, dirty2D flag2D)
    old: extend public void invalidate(Object[] objs)
    new: extend public void invalidate2D(Object->dirty2D objs)

xclipScene.cm:
    old: extend public void invalidate(Object z)
    new: extend public void invalidate2D(Object z, dirty2D flag2D)
    old: extend public void invalidate(Object[] objs)
    new: extend public void invalidate2D(Object->dirty2D objs)

xclipSpaceManager.cm:
    old: final public void invalidate(Object obj)
    new: final public void invalidate2D(Object obj, dirty2D flag2D)
    old: final public void invalidate(Object obj)
    new: final public void invalidate2D(Object obj, dirty2D flag2D)
    old: extend public void invalidateWormholeViewers(Object[] objs)
    new: extend public void invalidateWormholeViewers(Object->dirty2D objs)