The site-wide social login system is now backwards-compatible with how
the social_login_active core pref worked since commit
3b2d8333b6.
social_login_active's least significant bit is now treated as a global
bit, so if it's not set, no other bits are allowed to be set. This
un-breaks all existing checks for whether social_login_active is empty.
Except in themes, the social_login_active check has been replaced with
an e_user_provider API to check if social login is enabled site-wide.
- MOD: Replaced e107::getPref('social_login') with
SocialLoginConfigManager::getValidConfiguredProviderConfigs()
- FIX: signup_shortcodes updated with new social login providers
- MOD: e107::filter_request() code de-duplication: HTTP 400 exits
- MOD: Deprecated e107::getHybridAuth() to discourage direct access to
third-party dependency Hybridauth
- FIX: Updated e_user_provider for Hybridauth 3
- FIX: e_user::tryProviderSession() and Hybridauth 3
- NEW: Dynamic auth provider support in social_adminarea
- NEW: Database migration for social plugin's social_login pref
