Add explicit logger handler management

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Add Loggers.withRootHandler method

withRootHandler sets logging Handler for root Logger.
All loggers obtained through Logger.getLogger method or the likes
delegates log record publishing up to root Logger.

Add HandlerProvider interface to allow deterministic closing of
logging Handlers
Minor cleanup
Merge branch 'master' of github.com:sviperll/chicory

Conflicts:
	chicory-common/src/main/java/com/github/sviperll/logging/Loggers.java