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In the case of nested timeline in the toplevel timeline we ended up
with CompositionUpdate for seeks sent by our own composition to
granchildren composition. This was not causing essential issues
if all tracks where containing nested timelines but in cases
where one of the tracks only had a nested timelines, then we
were waiting forever for a `CompositionUpdateDone`.

CompositionUpdate translated into ASYNC_START/ASYNC_DONE should
be kept inside the GESTimeline and not travel up (possibly to some
parent GESTimeline).

The field was already expected in the launcher

And use it in both gesdemux and gessrc

Allowing a proper seek EOS handling with nested compositions

And remove useless .h files

Paving the way to removing pending fields to make the code
simpler to follow.

When linking loaded proxies and trying to setup their targets

And fix paste annotation

This means we can use some newer features and get rid of some
boilerplate code using the G_DECLARE_* macros.

As discussed on IRC, 2.44 is old enough by now to start depending on it.

For smptealph element to work as expected the following compositing
element should mix with the default "over" operator, as described
in its documentation.

Otherwise method order resolution will not be correct

We need it to be initialized to be able to parse our options

And update the cache

Fixes gst-docs#36

It has nothing to do in our namespace/API