SONARPLUGINS-3624 Stop support of SQ server older than 3.7
SONARPLUGINS-3575, SONARPLUGINS-3604, SONARPLUGINS-3574
 * Move parsing of sonar-project.properties files to SQ Runner
 * Trim properties read from configuration files
 * Add an official property to specify a project baseDir different than current directory
SONARPLUGINS-3329 Display "SONAR_RUNNER_OPTS" in the console if it is set
Fix some quality flaws
SONARPLUGINS-3634 Provide a simulation mode allowing to dump input configuration
Replace System.out.println calls with Logging calls
Allow specification of log level via property and from command line