Adds a groupcache-based cache with caveats, PoC. #25
+935
−0
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This reimplementation will create a cache from the default config if one doesn't exist when a tile is set. This results in a locked map check on every set. I don't like it, but it's a PoC. Fillfuncs are nil, so one of the larger value-props for groupcache is moot until that is implemented.