Make coral work similarly to farmland.

Currently, coral can be frustrating to build with outside of water as each individual block needs to be touching water in order to stay alive. I suggest that coral should work similar to farmland, where as long as there is a water source nearby it will stay hydrated. You could also make it so that if a coral block is touching water, it becomes a sort of "source" block, meaning that nearby coral blocks touching the source one will remain hydrated even if they don't have an adjacent water source. The same would apply to all types of corals such as the fans.

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