upload_formats shold be a list

[CarlFK]

veyepar.cfg supports:
upload-formats=mp4 webm
which gets split() into a list:
self.options.upload_formats = self.options.upload_formats.split()

the ini format doesn't support lists:
"always storing them internally as strings"
https://docs.python.org/3/library/configparser.html#supported-datatypes

so to get rid of the split() we would need to use a format that supports lists.
yaml would be my choice.