Use log4j2 and slf4j properly, add maven-dependency plugin

[Frawless]

Description

This PR use slf4j properly in our implementation. It will now allows to users to specify their own logger implementation. In the tests we use log4j-slf4j2-impl.

I also added maven-dependency-plugin to remove unneeded dependencies

Type of Change

• Bug fix (non-breaking change which fixes an issue)

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit/integration tests pass locally with my changes