- Fixes a JWT decoding issue in the OpenID provider
- Updates the GitHub provider to use the authorization header for authentication
- Updates the Twitch provider for Twitch's v5 API changes
- Adds the email and is_private_email fields to the Apple provider's GetUser implementation
- Modifies gothic to export a non-collidable context key for setting the Provider in a context.Context
- Adds new scopes to the Spotify provider
- Adds the IDToken from OpenID providers on the user struct
- Make Apple provider's SecretParams public
- Adds support for sign in with Apple, and drops support for Go versions 1.7 and 1.8
- Fixes the Slack provider's FetchURL logic to use the appropriate scope for the info it needs
Signed-off-by: Oscar LÃfwenhamn <oscar.lofwenhamn@cgi.com>

* initial stuff for oauth2 login, fails on:
* login button on the signIn page to start the OAuth2 flow and a callback for each provider
Only GitHub is implemented for now
* show login button only when the OAuth2 consumer is configured (and activated)
* create macaron group for oauth2 urls
* prevent net/http in modules (other then oauth2)
* use a new data sessions oauth2 folder for storing the oauth2 session data
* add missing 2FA when this is enabled on the user
* add password option for OAuth2 user , for use with git over http and login to the GUI
* add tip for registering a GitHub OAuth application
* at startup of Gitea register all configured providers and also on adding/deleting of new providers
* custom handling of errors in oauth2 request init + show better tip
* add ExternalLoginUser model and migration script to add it to database
* link a external account to an existing account (still need to handle wrong login and signup) and remove if user is removed
* remove the linked external account from the user his settings
* if user is unknown we allow him to register a new account or link it to some existing account
* sign up with button on signin page (als change OAuth2Provider structure so we can store basic stuff about providers)

* from gorilla/sessions docs:
"Important Note: If you aren't using gorilla/mux, you need to wrap your handlers with context.ClearHandler as or else you will leak memory!"
(we're using gorilla/sessions for storing oauth2 sessions)

* use updated goth lib that now supports getting the OAuth2 user if the AccessToken is still valid instead of re-authenticating (prevent flooding the OAuth2 provider)