JetCMX XML->JSON L1Menu migration
Migrates JetCMX to use new L1Menu.
Note that I still ended up with m_configSvc->thresholdConfig()->caloInfo().jetWindowSizeSmall()
and m_configSvc->thresholdConfig()->caloInfo().jetWindowSizeLarge()
to figure out whether it was a small or large jet window, so I couldn't remove the LVL1ConfigSvc entirely. What should I use as an alternative? Question for @watsona, @afaulkne or @stelzer.
Cheers,
Stewart