* replace swiftmailer references with generic interface references
* replace swiftmailer dependency with suggested symfonymailer (option to also use old swiftmailer)
* remove getSwiftMailer fro mtests
* adjuts config to skip yii2 coded swiftmailer
* dev and test only until php 7.4 (synphonymailer)
* init github actions
* init github actions: test run on feature branch
* github actions: remove alternative mysql port
* github actions: expose mysql port
* github actions: install & try migrations
* github actions: adjust test db configuration for github actions
* github actions: run tests
* github actions: fix codeception db connection add actions badge
* github actions: try only php8
* github actions: add php 7.4
* github actions: dont fail fast
* github actions: save test-outputs as artifacts
* github actions: save test-outputs only on fail
* github actions: save runtime folder in artifacts on failed build
* github actions: save runtime folder in artifacts on failed build
* github actions: save error logs for tests
* github actions: log error if unable to send email on new user creation
* github actions: change log conf
* github actions: add tests yii2:transaction=false to pass tests on php < 8
* github actions: add tests yii2:transaction=false to pass tests on php < 8
* github actions: remove travis
* github actions: add changelog
