Use URL & URLSearchParams API for parsing URLs

[Crystal-RainSlide]

This will simplify the code in url.js.

url.js as of commit afa5331

See:

• https://developer.mozilla.org/en-US/docs/Web/API/URL_API
• https://developer.mozilla.org/en-US/docs/Web/API/URL
• https://developer.mozilla.org/en-US/docs/Web/API/URLSearchParams
• https://javascript.info/url
• https://nodejs.org/api/url.html

Also see: medialize/URI.js