Add optional movement on push to buttons (based on patch from Soeren

Add optional movement on push to buttons (based on patch from Soeren

Sat Aug 25 19:02:39 2001  Owen Taylor  <otaylor@redhat.com>

        * gtk/gtkbutton.[ch] gtk/gtktogglebutton.c: Add optional movement
        on push to buttons (based on patch from Soeren Sandmann, #54720)

          - Add child_displacement_x/y style properties to control how far the
            child moves when the button is depressed.

          - Add non-exported function _gtk_button_set_depressed to clean
            up the handling of the in/out shadow and separate it frmo
            widget->state.

          - Lots of code cleanup and simplification of state handling
            for GtkButton/GtkToggleButton.

        * tests/testgtkrc: Set the x/y displacement to 1 to provide a test
        of button movement. testgtk + testgtkrc == test ugly GTK+, as always.