This is to make ges_play_sink_convert_frame available to the bindings.

This make the bindings compiling without warning

defs files have been generated with the h2defs.py script

Make it binding friendly

Vertical and horizontal position properties of the title source
can be set and get.

Color property of the text overlay can be set and get.

Vertical and horizontal position properties of the text overlay
can be set and get.

Added the center and position options to the vertical, and horizontal
properties of text alignment.

run gst-indent through ges-timeline-text-overlay.h and
ges-track-text-overlay.h

Color property of the text overlay can be set and get.

now users can select the desired rendering audio format and
container through --aformat and --format, like in ges-launch.

clean the make_ogg_vorbis_profile () code.
remove extra second of execution time.
clean some comment typos.

remove unnecessary sources GList.
and fix comment typos as well.