ext/cairo/gsttextoverlay.c: Improvements to actually render text as white on black outline on video, including font s...

Original commit message from CVS:
* ext/cairo/gsttextoverlay.c: (gst_textoverlay_render_text),
(gst_text_overlay_blit_1), (gst_text_overlay_blit_sub2x2),
(gst_textoverlay_video_chain), (gst_textoverlay_loop),
(gst_textoverlay_font_init), (gst_textoverlay_init),
(gst_textoverlay_set_property): Improvements to actually
render text as white on black outline on video, including
font selection and horizontal/vertical alignment.  (Ronald's
christmas present)
* ext/cairo/gsttextoverlay.h: