Carting the demiquaver

Quite a few changes here:

• About as close as I’m going to get to a final building set at this early date. There are 52 of them, which has a pleasing familiarity to it given the vacuity I’m building this game on.
• Added a key.
• Buildings continue to be coloured for their primary terrain constraint. Currently everything is bound to a single terrain. I’d like to make a few bivalent later, eg paddocks, but there’s no rush
• Buildings are shadow coloured per their primary resource cost for construction.
• Technologies are coloured for their primary resource cost for research.
• The above two mean that the building and tech cost graph edges have been removed. This makes the graph much cleaner and more readable.
• Dark edges mark the tech graph. Light edges mark the building input/output graph.
• I’ve not marked money inputs or how many of an input are required or output.
• Technology tiers are marked and grouped. The intention is that when a City State researches something in a new/higher technology tier, that ALL buildings in the City State at tier-2 will be instantly removed from the board, including any product markers on them. (It is possible that I’ll change this to build a building instead of research, but that’s a fairly small change). It is left as an exercise for the reader to see the rather severe problem that this tier-2 destruction poses for a budding City States as well as the matching implications for game strategy and timing for players.