ext/cairo/: Port cairo textoverlay plugin to 0.9. Add 'shaded-background' property...

ext/cairo/: Port cairo textoverlay plugin to 0.9. Add 'shaded-background' property and redo position. Doesn't handle ...

Original commit message from CVS:
* ext/cairo/Makefile.am:
* ext/cairo/gstcairo.c: (plugin_init):
* ext/cairo/gsttextoverlay.c: (gst_text_overlay_base_init),
(gst_text_overlay_class_init), (gst_text_overlay_finalize),
(gst_text_overlay_init), (gst_text_overlay_font_init),
(gst_text_overlay_set_property), (gst_text_overlay_render_text),
(gst_text_overlay_getcaps), (gst_text_overlay_setcaps),
(gst_text_overlay_text_pad_linked),
(gst_text_overlay_text_pad_unlinked), (gst_text_overlay_shade_y),
(gst_text_overlay_blit_1), (gst_text_overlay_blit_sub2x2),
(gst_text_overlay_push_frame), (gst_text_overlay_pop_video),
(gst_text_overlay_pop_text), (gst_text_overlay_collected),
(gst_text_overlay_change_state):
* ext/cairo/gsttextoverlay.h:
Port cairo textoverlay plugin to 0.9. Add 'shaded-background'
property and redo position. Doesn't handle upstream renegotiation
yet though.