Video compression in Slicer core

[jcfr (Jean Christophe Fillion Robin (Kitware))]

@ungi

think we should go ahead with the extension plan.

@leochan2009 is making good progress. See GitHub - openigtlink/SlicerOpenIGTLink: OpenIGTLinkIF module as an Slicer Extension

@leochan2009 Let me know if you need help removing the OpenIGTLink build options from Slicer build system.