Growing grass

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Spread grass blocks by 'growing' onto adjacent dirt blocks (turning into grass blocks)

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See also GH-1, water flow algorithm. But water would flow into air blocks, grass into dirt blocks

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For reference: GlowstoneMC/Glowstone@88bf270 Add basic random blocks tick (includes grass and crop growth; chances, other block proximity; events)

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https://github.com/konstructs/server-plugin-grass - simple plugin for konstructs (another open source voxel game) (MIT licensed), possibly useful reference