Add cmdline options for the visibility of menubar and tabbar
Since the menubar and tarbar settings are now global instead of per profile , those cmdline options are useful to allow users to override the defautl behavior. The --hide-menubar and --hide-tabbar options can be used together to simulate the miminal interface of xterm. I'm not sure whether --show-menubar and --show-tabbar will be widely used , but add them at the moment for the sake of completeness.
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