feat: Extend CVPixelBufferRef and export the new functions from CVPixelBuffer

[iparaskev]

Adds the following functions to CVPixelBufferRef

• get_width
• get_height
• get_bytes_per_row_of_plane

and exports them from CVPixelBuffer.

[iparaskev]

I hadn't seen #27 before making this. I will use it, and close this if it isn't needed anymore.

[iparaskev]

While trying to use the new branch I noticed that a few things that I need are not there yet (correct me if I have missed something), in particular:

• SCStreamConfiguration is missing setting a few variables.
• CMSampleBuffer is missing a function to access the pixel buffer.
• get_bytes_per_row_of_plane is still missing from CVPixelBuffer.

Would it be OK if I create patches for use_core_foundation_types with these additions?

Regardless, I will still close this as the old implementation will be deprecated and until then I can use my own fork.

[1313]

working on getting 0.3.0 out.

The CoreVideo stuff used: https://github.com/doom-fish/core-frameworks