Cleanup MCUtils patch for chunk system

Remove utilities that are unused, as well as replacing
the full chunk map with a concurrentutil implementation.

Additionally, fix the addition/removal of chunks to/from the
full chunk map so that getChunkIfLoaded correctly returns a
non-null chunk when calling the load or unload events.

patches/server/0826-Fix-block-place-logic.patch

@@ -22,10 +22,10 @@ index 7d76cdc59984b156628273c8357485eb10046007..7180996027f70aef7afe32fb2adfce64
                      itemstack.consume(1, entityhuman);
                      return InteractionResult.sidedSuccess(world.isClientSide);
 diff --git a/src/main/java/net/minecraft/world/level/Level.java b/src/main/java/net/minecraft/world/level/Level.java
-index b97427789d6162e16b9c3a56b89b2dd08a04297f..b8d8041aecc2ff008247449cba8d9f192cf51073 100644
+index 210c3b6167dac93e550fe849e34b5aa404ab6dce..ed1c50d31fc077e4e009719fa622a44edefcdf2c 100644
 --- a/src/main/java/net/minecraft/world/level/Level.java
 +++ b/src/main/java/net/minecraft/world/level/Level.java
-@@ -554,17 +554,18 @@ public abstract class Level implements LevelAccessor, AutoCloseable {
+@@ -552,17 +552,18 @@ public abstract class Level implements LevelAccessor, AutoCloseable {
                  // CraftBukkit start
                  iblockdata1.updateIndirectNeighbourShapes(this, blockposition, k, j - 1); // Don't call an event for the old block to limit event spam
                  CraftWorld world = ((ServerLevel) this).getWorld();