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If the accept-caps succeeds with a different subelement, then the subsequent
caps event will change the current subelement.

Conflicts:
	sys/uvch264/gstuvch264_src.c

Needs some reworking.

Instead of home-grown solution.

Use multifdsink for pipes instead of multisocketsink,
to avoid "creating GSocket from fd 9: Socket operation
on non-socket "criticals from Gio. Test still fails,
but it fails in a different way now.

Try to send the streamheader after the first buffer.

Since we now include this into the unit tests directly, don't define the default
category macro because it conflicts with check.

We have removed things like protocol=gdp in the tcp elements
in favour of explicit gdppay/depay elements, so there's no need
to keep a public API and library for now. We can still add it
back later. Someone needs to think hard about 0.11 and gdp
anyway one of these days.

Ensure correct indentation and retab
Make sure all structure have padding

Rename the GST_BUFFER_FLAG_PREROLL to GST_BUFFER_FLAG_LIVE and give the new flag
a meaning. The old PREROLL flag never had a clear meaning.

Make a new method to allocate a buffer + memory that takes the allocator and the
alignment as parameters. Provide a macro for the old method but prefer to use
the new method to encourage plugins to negotiate the allocator properly.

Improve GstSegment, rename some fields. The idea is to have the GstSegment
structure represent the timing structure of the buffers as they are generated by
the source or demuxer element.
gst_segment_set_seek() -> gst_segment_do_seek()
Rename the NEWSEGMENT event to SEGMENT.
Make parsing of the SEGMENT event into a GstSegment structure.
Pass a GstSegment structure when making a new SEGMENT event. This allows us to
pass the timing info directly to the next element. No accumulation is needed in
the receiving element, all the info is inside the element.
Remove gst_segment_set_newsegment(): This function as used to accumulate
segments received from upstream, which is now not needed anymore because the
segment event contains the complete timing information.

Hide the GstStructure of the event in the implementation specific part so that
we can change it.
Add methods to check and make the event writable.
Add a new method to get a writable GstStructure of the element.
Avoid directly accising the event structure.