Moved logging-related code to a dedicated module, did some changes in
sensor string termination

- logging-related code (init, message logging) has moved to
modules/logging_module.(h/cpp). 
- initialization function has been renamed initLogging() 
- logging function has been added a boolean parameter used to append or
not line termination characters
- project properties and HAO-tracker's main have been changed
according to this refactoring
- sensor string termination has been modified to include line
termination characters (this + the boolean parameter in logMessage fix
the line termination duplication bug)