Improve Database handling

[Zoriot]

We could even further enhance it, maybe with a ORM + Database Migration Framework (JDBI/Hibernate and FlyWay). Or use the Wrapper from minefact which also have some performance profiling / debug logging. https://github.com/MineFact/StandardPlugin/blob/master/src/main/java/de/minefact/utils/database/MySQL.java Should be made in the Library & implemented in the plugins.