Handle bar commands outside config file

Our initial implementation of `bar {  }` assumed that the commands could
only be used in the config. This is not true for two commands:

* bar mode
* bar hidden_state

This patch makes it possible to issue these commands outside a bar
block, for instance through swaymsg

    $ swaymsg bar mode hide bar-0

This does not implement the `barconfig_update` IPC event which should be
trigged from these commands. I have added TODO's where this should be
added once implemented.

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