Major refactoring and TYPO3 10 compatibility

[!!!][FEATURE] Auth-Service now uses AbstractAuthenticationService
[!!!][FEATURE] Old Dev-Log has been removed and a custom log bases on TYPO3 logging API has been introduced
[!!!][TASK] Migrate sf_yubikey:checkyubikeyotp to symfony console
[TASK] Moved CI from Travis CI to GitHub Actions
[TASK] Make v10 tests use typo3/testing-framework ^6.1
[TASK] Cleanup ext_emconf.php

Added PHP 7.3 compatibility

2.3.0

[RELEASE] Updated version to 2.3.0

Support for multiple API endpoints

[TASK] Support multiple API endpoints for validation requests

Support validation protocol version 2.0

[TASK] Support validation protocol version 2.0

Added PHP 7.2 and TYPO3 v9 compatibility

2.2.0

[RELEASE] Release of version 2.2.0

Support for curlProxyServer

• Added support for [SYS][curlProxyServer] setting

YubiKey field in user settings

[FEATURE] Added Yubikey field to user settings

TYPO3 V8 compatibility

• Added support for TYPO3 V8
• Raised min. PHP version requirement to PHP 5.5
• Dropped TYPO3 6.2 support

Bugfix

[BUG] Fixed non working autoloading #33

Bugfix

• Added missing Yubikey fields for fe_users
• Added composer support
• Updated code style