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Change how dirt turns to dirt_with_(something)
This changes how dirt blocks turn to dirt_with -grass, -dry_grass or -snow. Previously, dirt that was sunlit would turn to dirt_with_grass no matter what, but this happened without any context, so you could get green patches of dirt_with_grass in the middle of a savannah or even desert. Dirt no longer turns to covered dirt unless it's within 1 node from another dirt_with_grass or dirt_with_dry_grass or dirt_with_snow. This makes dirt_with_grass "growback" a lot slower, since it now only happens on the edges, but it retains the context nicely now. If there is any dirt with a grass or dry grass plant, or snow on top, and enough light, we'll convert it sporadically to dirt_with_grass or dirt_with_dry_grass or dirt_with_snow. This allows us to plant grass of our choice in a large dirt patch, or in a region where otherwise that type of grass is not present. This used to be done by 2 abms, but I've combined them in to a single ABM that is ordered to run with maximum efficiency, solving for the most common outcome first before attempting more complex checks.
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