NavDisplay Refactoring

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Background

See also Howto:Prototyping a new NavDisplay Style.

We need to clean up the ND code, this page is intended to keep a list of items pending.

Switch handling

• move switches into the aircraft-specific style hash
• rename value to default_value
• add an optional values:[] vector
• add a UI hash to contain UI specific fields (legend/tooltip)
• also use the UI hash for placement info (top/bottom, i.e. above/below the ND)