bayer pattern support

[niall-us]

Is your feature request related to a problem? Please describe.
I often need to work with streams from cameras which use 4 channels (R, G1, G2 and B) in a Bayer pattern.

Describe the solution you'd like
Display Bayer pattern for RAW8/10/12/16 with component selections for the above.

Describe alternatives you've considered
I've used PixelViewer for this, but it insists on MIPI order for RAW10/12/14.