[feature/oauth] Include OAuth library in composer.json

PHPBB3-11673
[feature/oauth] OAuth provider skeleton

PHPBB3-11673
[feature/oauth] OAuth as a symfony service

PHPBB3-11673
[feature/oauth] Start implementing login

PHPBB3-11673
[feature/oauth] Additional work on implementing login

PHPBB3-11673
[feature/oauth] Check that the service actually has settings

PHPBB3-11673
[feature/oauth] Token Storage Skeleton

PHPBB3-11673
[feature/oauth] Allow getting original global arrays from request

PHPBB3-11673
[feature/oauth] Change name of new method on request

PHPBB3-11673
[feature/oauth] Continue work on OAuth login

PHPBB3-11673
[feature/oauth] More work on login

PHPBB3-11673
[feature/oauth] Document and rearrange methods

PHPBB3-11673
[feature/oauth] Use DB for OAuth token storage

PHPBB3-11673
[feature/oauth] Have token storage use DB

PHPBB3-11673
[feature/oauth] Update invocation of method in OAuth

PHPBB3-11673
[feature/oauth] Store anonymous user by session id

PHPBB3-9734
[feature/oauth] Pass table in constructor

PHPBB3-11673
[feature/oauth] Fix typo

PHPBB3-11673
[feature/oauth] Have array of services not just one in oauth

PHPBB3-11673
[feature/oauth] Anonymous user does not depend on user_id in token

PHPBB3-11673