Migrate to Log4j 2 using the 1/2 bridge.

[marco-brandizi]

Use this to change all Ondex modules so that:

• They depend on log4j-api-2
• They also depend on log4j-1.2-api, which will reroute all Log4j v1 to version 2 (ie, to the API above)
• Same for slf4j and common logging (TODO: link to bridges), but Log4j v1 is a priority
• Modules that use a concrete implementation of any logger, migrate to log4j-core as their implementation
  (so that all of the above is re-routed).
  • This also requires that the log4j.xml files are migrated to v2 (YAML flavour preferrable)
  • A good way to deal with the config files is downloading them from a single place (like the data module)

This is to address the recent security issues discovered with old Log4j. It has not a very high priority, since said issues are relevant only for web servers, yet, the migration above would remove many warnings triggered by dependabots and IT people.