No Navy by Lake Cities for Vox Populi v 5

Prevents lake cities from producing naval units. By default, it blocks all naval units (including workboats&cargo), but can be easily customized to disallow just melee&submarines (or any combat class you like), instructions are in Buildings.sql. It works by creating a new Dock building which is granted to all coastal cities upon founding. Naval units are locked behind the Dock, hence lake cities cannot produce them.