Avoid Unnecessary Graph Searches by Checking for State Changes

[douira]

Avoids rebuilding the render lists and doing a graph search more often than necessary by checking if the section actually changed in a way that's relevant to the graph search. For worlds that update their blocks frequently (every tick or every redstone tick) this avoids half the graph searches. Some graph searches are still necessary to schedule rebuild tasks, but when the task results come back, this doesn't do another graph search unless the section's visibility data or build state changed in a way that needs the render list to be updated.

In combination with async frustum culling where task collection is not bound to the graph search, this is even more effective.