[StandAlone] Log Listener Refactoring

This refactoring make LogListener homogeneous with Listeners Base Abstract Class design.
Of course, it less efficient but more undesrtanded avoiding Esper interfaces knowledge.
[StandAlone] standalone module skeleton created
[StandAlone] Fix Feature

Created an StandAlone launcher for CepEngine using BasicEvent.
Merge branch 'feature/StandAlone' into develop