Add account authentication support and fix VM urls

[elijahr2411]

• I don't know why I decided to do this but here we are
• Account sign-in works, registration and password resets can also be implemented later on
• tokens are saved to tokens.json in the current working directory and are automatically re-used
• The login form is all HTML for hcaptcha support. I could have made the username and password fields WinForms controls but the form would have to be unreasonably large to accomodate the captcha, so it's better to have it all in a WebBrowser so the captcha can cover the other fields
• hCaptcha refuses to load from a local source, so the form has to be remote. I've put it at https://collabhost.computernewb.com/collabvm-csharp-login.php (The PHP is just to load the hcaptcha site key from a query param, since i didnt want to deal with the hell that is IE JS more than I had to)
• I was able to get around IE embedding as IE7 by default without modifying the registry, as it turns out you can set it to IE11 mode through a meta tag
• newtonsoft.json is now a dependency