Implemented JWKS endpoint and JWT generation. Continuing refactoring

classes/IdTokenBuilder.php

classes/JWKSHandler.php

classes/Locator.php

classes/MySQLDAO.php

classes/OAuth2RequestHandler.php

classes/datalayer/AccessTokenDAO.php

classes/datalayer/DAO.php

classes/datalayer/JWKSDAO.php

classes/datalayer/mysql/BaseMySQLDAO.php

classes/datalayer/mysql/MySQLAccessTokenDAO.php

classes/datalayer/mysql/MySQLJWKSDAO.php

classes/model/AccessToken.php

classes/model/AuthPageModel.php

classes/model/InternalClient.php

classes/model/OAuth2Client.php

classes/model/OAuth2Data.php

classes/model/RAPClient.php

classes/model/RSAKeyPair.php

classes/model/SessionData.php

classes/model/User.php