Add video privacy status and progress bar to GUI

[ei2kpi]

• Add VideoPrivacyStatus enum to bulk_upoload.py
• Import VideoPrivacyStatus in init.py
• Pipe through privacy status into YouTube API
• Default privacy status is now Private (which is much safer!)
• Added GUI dropdown for Video Privacy Status
• Added check to ensure privacy status was valid
• Added relevant confirmation strings for Video Privacy Status

[beveradb]

Hey, nice work - thank you for contributing to the project! 🙇

I'll test and merge in a lil' bit 😄

[beveradb]

Released in version 0.4.0 - thank you! https://github.com/beveradb/youtube-bulk-upload/releases/tag/v0.4.0