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Default: Generalise, optimise and simplify grass spread function
Credit to tenplus1 for the suggestion to generalise for mod use. Mods can add mod nodes to 'group:spreading_dirt_type' enabling the function to work with mod nodes. Add some nodes to this group. Removing 'dirt_with_grass' etc. from 'neighbors' stops the ABM action running everywhere and constantly, on the dirt nodes immediately below the surface nodes. Now the action only runs in the rare case of a dirt node with neighbouring air, grass decorations or snow. Remove check for air above to allow grass to spread under light- transmitting nodes such as fences, walls, plants. This causes spread under slabs, stairs and glass, when near air, but seems worth it. Remove unnecessary check for nil node.
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