• implement colorspaces. Existing ImageGraphic uses rgb colorspaces.
• ImageYUVGraphic for yuv colorspaces yuv420p and yuv444p
• ImageBase that is inherited byImageGraphic and ImageYUVGraphic
• implement "bufferless" support in TextureArray using the cpu_buffer=False kwarg. Behaves exactly the same from the perspective of the ImageGraphic API! So image_graphic.data = new_data can be done just like before, but with bufferless it's much faster. ImageYUVGraphic is always bufferless.
• update image graphic tooltip to handle bufferless, caveat is that it's no longer possible to get exact grayscale values so it does an inverse transform using the LUT. Tooltip has a note that the value is approximate, should document in the docstring too.
• selector tools will not be able to grab the underlying data, document it and raise in the corresponding selector tools.
• NDImage can handle both ImageGraphic and ImageYUVGraphic
• NDImageProcessor subclass called VideoProcessor which can handle the tuple of arrays for (y, u, v)
• ndw_subplot.add_video() which just calls add_nd_image() with with processor_type=VideoProcessor
• docstrings for new functionality
• example for yuv colorspaces
• allow providing y, u, v explicitly, so it can be set directly from pyav.Frame.planes without creating an array which creates a copy.

  vh.current_frame
  Out[11]: <av.VideoFrame, pts=0 yuv420p 1600x1200 at 0x7f135828ea40>
  vh.current_frame.planes
  Out[12]: 
  (<av.VideoPlane 1996800 bytes; buffer_ptr=0x7f12441525c0; at 0x7f135828a6b0>,
   <av.VideoPlane 499200 bytes; buffer_ptr=0x7f1244341340; at 0x7f135828abb0>,
   <av.VideoPlane 499200 bytes; buffer_ptr=0x7f12443bcf00; at 0x7f135828b010>)
  

This gives us easy ~80fps on Gily's gerbil stuff which we were previously getting ~15fps on 🥳