v0.1.0

Project update

This is basically a rewrite and fundamentally changes how this extension works.

Notable changes:

• Download and subscribe buttons now get directly injected into the YouTube page
• On video pages, e.g. /watch you'll see a download / subscribe button to download that video or subscribe to that channel.
• On channel pages you will see a download / subscribe button to download every video from that channel or subscribe to that channel
• Throughout the interface, hover over the top left of the thumbnail to reveal a download button for that video.
• On the extension popup the URL field now holds the complete url including protocol and port. Protocol falls back to http:// if not specified and port to 80/443 if not specified, by @bakkot