Deoldify Vapoursynth filter

[Selur]

Updated the deoldify test version.

In order to allow SCDetect() to perform better on blend scenes I introduced a new boolean parameter "sc_normalize" in HAVC_ddeoldify() and "ScNormalize" in HAVC_main().
If this flag is enabled, the B&W frames used by misc.SCDetect() will be "normalized", in this way the SCDetect() filter will be more sensible and will be able to detect more blend scenes.

Nice.

Cu Selur