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Basically the tags we send before STREAM_START are now ignored, meaning
that we could not detect nested timelines anymore, this commits makes
sure that we send our tag event after getting pushing STREAM_START.

When a composition is nested into anotherone, we *know* that the
toplevel composition is going to send a stack initializing seek,
we can thus avoid sending it on the subcomposition itself when
prerolling. This avoid seeking roundtrips and we now have one and
only one seek travelling in the overall pipeline (after it has
prerolled).

The 'start' of nleobject is in the 'composition' scale, inpoint is in
the media scale, when outside a composition, a nleobject->start value
doesn't mean anything.

Instead of seeking each nleobject separately to setup new stack, wait
for the whole stack to preroll and then seek that newly setup stack,
leading to the same code path and seek 'tweaking' as when processing
a seek on the composition (without stack changes).

This is mandatory to properly handle filter that tweak segments to handle
time remapping for example.

In 99c45d42 we allowed setting
track-types but in the end we could do it generically using the
following synthax in the scenario 'properties' metadata:

`ges-options={--track-types=video,--disable-mixing}`

GParameter is part of our API, and for GLib < 2.54 we do not even have
a way around avoiding it (namely `g_object_new_with_properties`).

We should stop using GParameter once we depend on GLib 2.54.

Fixes #86

Cleanup a few things on the way.

And move ges-track-element deprecations to a dedicated header file

In general, brought the behaviour of the `start`, `duration` and
`inpoint` setters in line with each other. In particular:
1. fixed return value the GESSourceClip `duration` setter
2. changed the GESClip `start` setter
3. fixed the inpoint callback for GESContainer
4. changed the type of `res` in GESTimelineElement to be gint to
   emphasise that the GES library is using the hack that a return of -1
   from klass->set_duration means no notify signal should be sent out.

Also added a new test for clips to ensure that the setters work for
clips within and outside of timelines, and that the `start`, `inpoint`
and `duration` of a clip will match its children.

CID: 1416901
CID: 1439518
CID: 1439527

As it's done everywhere else

CID: 1455511

Cannot call python.dependency() if the python module was not found.

By passing NULL to `g_signal_new` instead of a marshaller, GLib will
actually internally optimize the signal (if the marshaller is available
in GLib itself) by also setting the valist marshaller. This makes the
signal emission a bit more performant than the regular marshalling,
which still needs to box into `GValue` and call libffi in case of a
generic marshaller.

Note that for custom marshallers, one would use
`g_signal_set_va_marshaller()` with the valist marshaller instead.

Support optionally coloring markers by reserving GES_META_MARKER_COLOR
for an ARGB guint.

Allows us to register a static meta without having to set a value.

The comment that was above _register_meta is actually meant for
_set_value.

Making it simpler for user to get the documentation

Otherwise there will be parameters with hyphen in their name in the GIR.

Avoiding potential deadlock when we remove tracks on a playing pipeline

We were misusing assertion and not properly setting the GError value

We were basically ignoring any segment update which could potentially
lead to setting a wrong stream time leading to wrong alpha value
being used.

And print a description of the encoding profile.

This can be made to work in certain circumstances when
cross-compiling, so default to not building g-i stuff
when cross-compiling, but allow it if introspection was
enabled explicitly via -Dintrospection=enabled.

See gstreamer#454 and gstreamer#381

Additionally give the previous marker position in the
GESMarkerList::marker-moved signal, since a user may want to know
where a move was from.

Also, fixed the documentation for GESMarkerList::marker-added

#78

Todo:
 - hook up data/completions/ges-launch-1.0 in Meson (#77)

Otherwise it might be used (e.g. by the plugin loader via the GES
plugin!) before ges_init() is called.

Prevents critical warnings during class_init()

Increase minor_version to 6 if a sub-project is saved under an asset or an asset includes a child stream-info element.

Basically the test project was plain broken as it had fully overlapping
clips is prohibited since the timeline edition API was reimplemented.

Fixes #62

We clearly uniquely identify assets by both their IDs and their
extractable type, and we should make sure that you can have a
TrackElement and a Clip with the same ID.

There is one exception in our implementation which is GESFormatter
because we treat their subclasses as 1 type with different IDs.