Remove all `print` calls from public API methods -- use logging instead.

[alxmrs]

I'm surprised that when I call xarray2video that there are a lot of non-error related traces in stdout. I expect that the public API methods of xarrayvideo to behave more like library code, and as such, to minimize printing to stdout/stderr.

I can see wanting to debug the pipeline sometimes, so to that end, I think using standard Python logging is a better fit than print() statements.

[OscarPellicer]

Hi Alex,

Thank you for your comment! I have removed the print statements and replaced them using proper Python logging.
I acknowledge however that the current situation is not perfect.
As it is now, there are two ways of specifying the log level:

arr_dict= xarray2video(jc_data, 'custom', conversion_rules,
                       output_path=output_path, compute_stats=True,
                       loglevel='quiet', #verbose, quiet
                       save_dataset=True, #Disable saving?
                       verbose=False,
                       ) 

• loglevel is passed to ffmpeg directly
• verbose is what my library now uses

Still, while having all set to quiet and False, some codecs like x265 like to output to stderr. I'm not sure I can do much about that.