Remove cnes-report from cnes-scan

[louisjdmartin]

The new release of cnes-report work as plugin, so this PR updates cnes-scan to work with latest cnes-report.

Changes:

• By default, cnes-scan search the cnesreport.jar in sonar plugins (before: looking for /opt/sonar/extensions/cnes/cnesreport.jar now: /opt/sonar/extensions/plugins/cnesreport.jar)
• Web interface to generate report is removed (Web interface is now managed by cnesreport)
• Some cleaning in the repo (remove JetBrains index files and update gitignore)
• Some improvement to GUI (GUI enhancement #6)

Warning:

• This new version of cnes-scan is not working with old version of cnes-report (min version: 2.2.0)
• By upgrading cnes-scan and cnes-report you may check templates stored in /opt/sonar/extensions/cnes
  • excel: new version of cnes-report provide "metrics" sheet.
  • docx: new version of cnes-report provide some metrics.
  • tip: latest templates are available here