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>
