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We should not forward allocation queries for audio to the video sink.

Make sure the caps event gets to the sink.

Rename decodebin2 -> decodebin some more
Cleanup up sinkpad event handling

We must not forward the caps event. instead we will decide what to do when the
pad block is taken.
Use decodebin instead of decodebin2

Conflicts:
	gst/rtp/gstrtpvrawdepay.c

Fixes compiler warning on mingw32

GstProbeType, GstProbeReturn and GstActivateMode -> GstPad*

Fixes (part of) #638711.

... but as not spec'ed especially, consider it a VfW compatibility case.

Fixes #659837.

We require a new-enough libflac that this condition will never apply.

Not that this seems to be actually needed, libflac happily decodes
stuff even if we just drop all headers and never feed it to the
library.

This would probably have been too invasive to do in the 0.10
branch, with all the pull-mode and parser handling code in
there.

The probes were ported wrongly and caused deadlocks.

jpegdec (using libjpeg 6.2/8) can't decode some lossless types of JPEG.

https://bugzilla.gnome.org/show_bug.cgi?id=556648