Blender Git Loki

VideoDecklink: accept mode index, test dvp.dll presence, enable audio just in case.

mode index instead of mode name can be used when opening the card:
VideoDecklink("1/2vuy",0)
The list of video mode is specific to each board and this method is
therefore not generic. Only use it for debugging purposes.

VideoDecklink will not throw if dvp.dll is not found when opening a Decklink
card on Windows with a nVideo Quadro GPU; instead it will fallback on
standard OpenGL transfer. It is preferable to use dvp.dll when possible as it
provides faster image transfer to Quadro GPU.

Audio Input is now enable by default with 48KHz sampling, 16bit samples and
2 channels. This is normally not necessary because audio is not used in
VideoTexture; it is just in case it is necessary on certain Decklink card.