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Assign unique sequence number to an object name for better debugging

deleting a QOpenGLFrameBufferObject needs to occur on the same thread it
was created on in order to actually free the relevant resources
immediately.  Otherwise, they will be queued for deletion and not freed
until the associated QOpenGLContext is destroyed.

This concept was only used by the "multi"-lost timer, and since that
one is not around any longer, the "num" concept is superfluous.

This is a concept that only applies when a buffer arrives in the chain
function, and it has already been scheduled as part of a "multi"-lost
timer.

However, "multi"-lost timers are now a thing of the past, making this
whole concept superflous, and this buffer is now simply counted as "late",
having already been pushed out (albeit as a lost-event).

There is a problem with the code today, where a single timer will
be scheduled for a series of lost packets, and then if the first packet
in that series arrives, it will cause a rescheduling of that timer, going
from a "multi"-timer to a single-timer, causing a lot of the packets
in that timer to be unaccounted for, and creating a situation in where
the jitterbuffer will never again push out another packet.

This patch solves the problem by instead of scheduling those lost packets
as another timer, it instead asks to have that lost-event pushed straight
out.

This very much goes with the intent of the code here: These packets are
so desperately late that no cure exists, and we might as well get the
lost-event out of the way and get on with it.

This change has some interesting knock-on effect being presented in
later commits. It completely removes the concept of "already-lost", so
that is why that test has been disabled in this commit, to be
removed later.

Make sure to set the time the buffer is supposed to arrive at, so
as not to trigger an artificial situation.

Split it up in code related to the timer, (do_lost_timeout) and code
to insert a lost-item/event and update private jitterbuffer-variables.

gstqtmux.c(644): warning C4133: '=':
  incompatible types - from 'gboolean (__cdecl *)(GstAggregator *,GstAggregatorPad *,GstEvent *)'
  to 'GstFlowReturn (__cdecl *)(GstAggregator *,GstAggregatorPad *,GstEvent *)'

Reset the splitmuxsink completely when changing states so that
it can be reused.

Fixes gstreamer/gst-plugins-bad#1241

This should result in no worse accuracy than the base parse element, and may
result in better accuracy. In particular, the number of bytes processed at any
given point, as accumulated by baseparse, can be only accurate to
(1 / # of frames) bytes per second, and if we try to seek immediately after
pausing the pipeline to a large offset, this small inaccuracy can propagate to
something noticeable.

The use case that prompted this patch is a 45-minute MPEG-1 layer 3 file, which
has a constant bit rate but no seek tables. Trying to seek the pipeline
immediately after pauisng it, without the ACCURATE flag, to a location 41
minutes in, yields a location that is, even with <gstreamer/gstreamer!374>,
still audibly incorrect. This patch yields a much closer position, no longer
audibly incorrect, and likely within a frame of the most correct position.

By the time sink_event is called, the pad's current caps have
already been updated. To address this, implement sink_event_pre_queue,
and check if the pad can be renegotiated there.

Fixes #707

Split the decision for keyframe request and fragmentation in order to
ensure periodic keyframe request.

It takes a qml scene description and renders it using a possible input
stream.

Currently supported on GLX and WGL.

Follow up to (as that MR had an old version of the commit):
- !475
- 4778d716: qt: add a qml overlay filter element

It takes a qml scene description and renders it using a possible input
stream.

Currently supported on GLX and WGL.

Techincally it is enough to activate at the beginning and then forget.

The example shows how to add qmlglsink to an already running pipeline
with pre-existing OpenGL elements.

Allows the application to be notified of the OpenGL context creation.