Fixes segfault as queries/events can happen after a reset

https://bugzilla.gnome.org/show_bug.cgi?id=684084

This is required since some systems (DirectSound and OS X) manage the
final byte order themselves.

https://bugzilla.gnome.org/show_bug.cgi?id=678021

../../../gst-plugins-base/gst/audioresample/gstaudioresample.c: In function 'gst_audio_resample_dump_drain':
../../../gst-plugins-base/gst/audioresample/gstaudioresample.c:729:9: warning: variable 'in_len' set but not used [-Wunused-but-set-variable]

https://bugzilla.gnome.org/show_bug.cgi?id=684063

pull-preroll signal returns a GstSample, not a GstBuffer

https://bugzilla.gnome.org/show_bug.cgi?id=684063

Don't try to include plugin that doesn't exist any longer
(merged into the playback plugin).

Improve the description of the latency-time and buffer-time properties in the
audio sink and source.

Expect a GstFlowReturn from the signal handler, just like from the callback.
Also use the return value.

https://bugzilla.gnome.org/show_bug.cgi?id=683865

Drain out the decoder when encountering a gap. Needed for DVD 'still'
sequences which consist of a single video frame, and a large gap
while audio plays.

Still frame events are not OOB downstream. Also, always send
immediately downstream.

Fix up all invocations.

Rename gst_collect_pads_add_pad_full() to gst_collect_pads_add_pad() and fix all
invocations.

Add support for I422_10

Fixes https://bugzilla.gnome.org/show_bug.cgi?id=683838

Fix reading of tags for the case filsrc ! footagdemux ! fooparse ! ..
where we would not read the tags because we never start our own
streaming thread.

https://bugzilla.gnome.org/show_bug.cgi?id=673185

streams with non-TIME segments will not have timestamps ...
... and therefore will never unblock the other streams.

Fixes blocking issue when using playbin suburi feature