I have the impression my entire files have been rewriten. Committing anyway, sorry.
Corrected code, following sonar advices
Merge branch 'feature/ghostbuster' into devel
Merge branch 'release/0.2.3'
Corrected Config.java according to sonar results
Corrected GhostKill.java to comply with sonar
Corrected Updater.java to comply with sonar
Merge branch 'hotfix/sonar' into devel