title-source: Rename ges_title_clip_set_backrgound_colour as appropriate

The method was badly called _clip_ instead of _source_ we have not release the API
so we still can change it.
pipeline: Always set the encoding profile presence to 1

We currenty do not support multiple tracks with same type in GESPipeline
and we actually need to set the presence field to avoid a scenario where
we have only video in a video track, and no audio in the audio track. So
audiotestsrc is used and we end up encoding the whole audio stream but
no decoded video frame as reached the decodebin src pad, so the pad
has not been created and thus it will not be linked to the encodebin.
On the audio part, the EOS will be emitted so fast that the resulting stream will
not have any video in it as the muxer will not even have a video pad created.

Setting the presence will ensure that the muxer does have a video pad
(because of how encodebin behaves) and thus will create a pad for it
and wait for its EOS.
ges: remove extra semicolon

https://bugzilla.gnome.org/show_bug.cgi?id=726365
container: Properly handle the case where we could not set parent

In this case we had a FIXME about reverting everything that was done,
implement that FIXME!
Properly generate versioning #define-s during autogen
Release 1.2.0
Back to development
ges: multifilesrc support

* GESMultiFileSource class
* multifilesrc example
* Support multifile:// urls in uri asset
* start/stop index modification
* Doc

https://bugzilla.gnome.org/show_bug.cgi?id=719373
ges-launch: Properly handle project loading

So we start the pipeline only when the project is done loading, and we save it when it is
loaded, taking into account possible media URI updates.
ges-launch: Add a way to mute test video and audio output
ges-launch: Play nicely with gst-validate if avalaible
ges-launch: Format the position printing as in gst-validate and friends
pipeline: Do not set EncodingProfile.presence when we have no track for the type

That leads to freeze as encodebin will be waiting for a pad and EOS
forever
build: install ges-version.h
multifilesrc: remove unused class declaration