Move preferences to ArgValue's

[tresf]

Adds all configurable preferences attributes to --help.

PREFERENCES
  Preferences can be set via "export QZ_OPTS=-Dfoo.bar=<value>", command line via "java -Dfoo.bar=<value> -jar qz-tray.jar" or via file using qz-tray.properties

  tray.notifications          Show verbose connect/disconnect notifications in the tray area [false]
  tray.headless               Start QZ Tray in headless (no user interface) mode [false]
  tray.monocle                Enable/disable the use of the Monocle for JavaFX/HTML rendering [true]
  tray.strictmode             Enable/disable solely trusting certificates matching authcert.override [false]
  tray.idle.printers          Enable/disable idle crawling of printers and their media information for faster initial results [true]
  tray.idle.javafx            Enable/disable idle starting of JavaFX for better initial performance [true]
  security.file.enabled       Enable/disable all File Communications features [true]
  security.file.strict        Enable/disable signing requirements for File Communications features [true]
  log.disable                 Disable/enable logging features [false]
  log.rotate                  Number of log files to retain when the size fills up [5]
  log.size                    Maximum file size (in bytes) of a single log file [524288]
  authcert.override,          Override the trusted root certificate in the software.
    trustedRootCert
  printer.status.jobdata      Return all raw (binary) job data with job statuses (use with caution) [false]