JavaPOS Config Loader with SLF4J logging support

The legacy logging implementation has been replaced by the logging facade SLF4J version 1, see https://www.slf4j.org/ for details on how to integrate. The Maven Central artifact 'org.slf4j:slf4j-simple:1.7.36' is a new dependency for this version.

What's Changed

• Replacing legacy logging by a SLF4J implementation by @kuniss in #10

Full Changelog: 4.0.2...5.0.0