JOC Cockpit for Windows should remove temporary deployment directories

Current Situation

• When running for Windows the JOC Cockpit deploys its .war file to a temporary directory, e.g. C:\ProgramData\sos-berlin.com\joc\temp
• This directory consumes some 65 MB for each restart of the JOC Cockpit.
• Administrators have to manually clean up the temp directory.
• This behavior does not apply to JOC Cockpit for Linux that cleans up the temp directory.

Desired Behavior

• JOC Cockpit for Windows should clean up its temp directory and behave similar to JOC Cockpit for Linux.

Maintainer Note

• Jetty is already configured to clean up the deployed directories but it doesn't work properly on Windows.
• The cleanup under Windows now takes over an additional servlet when Jetty is started and shutting down
  • The "cleanup" procedure of the servlet is called after JOC is completely deployed while Jetty starts so that some time will pass before the old deployed directories are deleted.
  • If Jetty is shutting down then the "cleanup" procedure of the servlet will delete all files of the current deployed directory too except the jar files in ./webapp/WEB-INF/lib because access is denied here.