Added Rule updateSuppressionBlock (#877)

Pull Request for https://github.com/fxmorin/UpdateSuppressionBlock

src/main/java/carpet/mixins/BarrierBlock_updateSuppressionBlockMixin.java

@@ -0,0 +1,55 @@
+package carpet.mixins;
+
+import carpet.CarpetSettings;
+import net.minecraft.block.BarrierBlock;
+import net.minecraft.block.Block;
+import net.minecraft.block.BlockState;
+import net.minecraft.block.Blocks;
+import net.minecraft.block.PoweredRailBlock;
+import net.minecraft.server.world.ServerWorld;
+import net.minecraft.util.math.BlockPos;
+import net.minecraft.util.math.Direction;
+import net.minecraft.world.BlockView;
+import net.minecraft.world.World;
+import org.spongepowered.asm.mixin.Mixin;
+
+import java.util.Random;
+
+@Mixin(BarrierBlock.class)
+public class BarrierBlock_updateSuppressionBlockMixin extends Block {
+    private boolean shouldPower = false;
+
+    public BarrierBlock_updateSuppressionBlockMixin(Settings settings) { super(settings); }
+
+    @Override
+    public int getWeakRedstonePower(BlockState state, BlockView world, BlockPos pos, Direction direction) {
+        return (shouldPower && direction == Direction.DOWN) ? 15 : 0;
+    }
+
+    @Override
+    public void neighborUpdate(BlockState state, World world, BlockPos pos, Block block, BlockPos fromPos, boolean notify) {
+        if (CarpetSettings.updateSuppressionBlockSetting != -1) {
+            if (fromPos.equals(pos.up())) {
+                BlockState stateAbove = world.getBlockState(fromPos);
+                if (stateAbove.isOf(Blocks.ACTIVATOR_RAIL) && !stateAbove.get(PoweredRailBlock.POWERED)) {
+                    if (CarpetSettings.updateSuppressionBlockSetting > 0) {
+                        world.getBlockTickScheduler().schedule(pos, this, CarpetSettings.updateSuppressionBlockSetting);
+                    }
+                    throw new StackOverflowError("updateSuppressionBlock");
+                }
+            }
+        }
+        super.neighborUpdate(state, world, pos, block, fromPos, notify);
+    }
+
+    @Override
+    public void scheduledTick(BlockState state, ServerWorld world, BlockPos pos, Random random) {
+        BlockPos posAbove = pos.up();
+        BlockState stateAbove = world.getBlockState(posAbove);
+        if (stateAbove.isOf(Blocks.ACTIVATOR_RAIL) && !stateAbove.get(PoweredRailBlock.POWERED)) {
+            shouldPower = true;
+            world.setBlockState(posAbove, stateAbove.with(PoweredRailBlock.POWERED, true), 3);
+            shouldPower = false;
+        }
+    }
+}