------
@nupplaphil: There is no easy possibility to add a logger here, that's why there
isn't any yet and instead a placeholder.. This execution point is a critical
state during a testrun, and tbh I'd like to leave here no further logic (yet)
because I spent hours debugging cases, where transactions weren't fully closed
and strange/unpredictable errors occur (sometimes -mainly during debugging other
errors :) ...)
-----
- Introduce own Yaml-to-SQL class
- Introduce new way of MySQL-DB-tests (per rollback)
- Remove dependency phpunit/dbunit
- Introduce new dev-dependency for YAML-ready (Symfony YAML reader)
- Add static connection for whole tests
- Introduce ExtendedPDO class to enable nested transactions
- Add rollback logic for tests to ensure reliability and increase speed
