#78 Hidden explorable tiles

[Glenn Rice]

Add an option that hides all tiles that have no
settlements and that roads are not leading to. Even
better would be to have it be a per tile option for a
given map. For example in the Sea Farers map, the
north island, with the exception of the gold tiles, is
supposed to be entirely hidden and random according to
the rules of the Settlers of Catan board game. It is
supposed to be revealed and randomly filled in as soon
as a boat or road reaches a node where a tile is missing.

[Micah Bunting]

I plan on adding this feature after I add random hex groups. This will allow tiles to be placed using the map editor. There will be a tab used to determine how many of each type of terrain and chit. The tab will be used for a few other options, such as fog. When the server loads the map, the tiles will be randomly distributed.