URL parsing logic is basically a straight port of how lbryio/lbry-sdk
parses lbry URLs. While there's a lot more going on, it should be
easier to follow what they're doing this way.
Also, added some light unit tests for the URL parsing using jest.
Which, of course, needed a babel config.
With this, tabOnUpdated was able to be rewritten more elegantly to
handle redirects as it delegates a lot of the work to utilities now.
YTtoLBRY:
* Use DOMParser for reading OPML
* OPML parsing was quite brittle as it relied on string parsing
* Removed dead script inclusion in the HTML page
* Removed global state variables
* Use fetch to clean up the query logic
* Promisified file, API calls, and settings querying to simplify logic
Many of the utilities involving APIs were isolated to a common module.
Particularly, ytService contains all methods for extracting IDs,
querying for the lbry URLs, parsing OPML, and more.
This functionally is heavily used in YTtoLBRY and lightly used by
tabsOnUpdated.
* All files were moved to the `src` directory, unchanged
* Parcel handles module resolution as well as transpilation via babel
* package.json, package-lock.json, and .gitignore were added
* Utilize crossplatform tools for build
