WMF: re-enabled video probes and made it more robust.

Fixed the way the custom MF Transform (getting the frames) works:
- Recreate it whenever we load a new media
- During media type negotiation between nodes, the MFT should support
  the same types as the video sink supports
- Allow input and output types to be changed as many times as needed,
  otherwise the topology cannot be resolved in some cases

Change-Id: I7ca77e1a3dee83643f1a97f2e6ada9c5c0e88309
Reviewed-by: Lars Knoll <lars.knoll@digia.com>

src/plugins/wmf/player/mfplayersession.h

@@ -232,6 +232,7 @@ private:
 
     IMFTopology *insertMFT(IMFTopology *topology, TOPOID outputNodeId);
     MFTransform *m_videoProbeMFT;
+    QList<MFVideoProbeControl*> m_videoProbes;
 };