gstpad: Add a new GST_PROBE_HANDLED return value for probes
In some cases, probes might want to handle the buffer/event/query themselves and stop the data from travelling further downstream. While this was somewhat possible with buffer/events and using GST_PROBE_DROP, it was not applicable to queries, and would result in the query failing. With this new GST_PROBE_HANDLED value, the buffer/event/query will be considered as successfully handled, will not be pushed further and the appropriate return value (TRUE or GST_FLOW_OK) will be returned This also allows probes to return a non-default GstFlowReturn when dealing with buffer push. This can be done by setting the GST_PAD_PROBE_INFO_FLOW_RETURN() field accordingly https://bugzilla.gnome.org/show_bug.cgi?id=748643
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