[eel-background] drawable deprecations (GTK2), rendering-cleanup (GTK3)

1. Don't use gdk_drawable_get_display (deprecated in 2.24)

2. Use GDK_PIXMAP_XDISPLAY(pixmap) directly instead of
GDK_DISPLAY_XDISPLAY(gdk_drawable_get_display(GDK_DRAWABLE (pixmap)))

3. Don't require GTK3 for stuff in GTK2.24, which we now require, and
don't use gdk_drawable_get_size at all. So, use (i/o = instead of):
gdk_window_get_width|height i/o gdk_drawable_get_size
gdk_window_get_screen       i/o gdk_drawable_get_screen
gdk_window_get_visual       i/o of gdk_drawable_get_visual

4. add eel_background_draw for GTK3, eel_background_expose for GTK2
This was removed in nautilus (after eel-background-box was removed):
http://git.gnome.org/browse/nautilus/commit/?id=87eb53a0701252607b494f34c677b6506f82278c

5. background: port to rendering-cleanup & cope with renamings of gnome-bg APIs
http://git.gnome.org/browse/nautilus/commit/?id=0b664aae4090704fa2e44d42f213da2cea8bd828
http://git.gnome.org/browse/nautilus/commit/?id=426079ef07d5f902911f30b0a9d7de95f3020374

6. Fix remaining issue #41: crashes w/ gdk_x_error BadPixmap when changing screen resolution
Remove eel_background_get_pixmap_and_color(), and use the pixmap/surface & color properties
in background->details directly, when needed. i.e. No more g_object/surface referencing.
And call eel_background_ensure_realized() and make_color_inactive() where appropriate.

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