Structure stuff including nether fortress gateways.

common/src/main/java/org/dimdev/dimdoors/mixin/NetherFortressPiecesAccessor.java

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+package org.dimdev.dimdoors.mixin;public interface NetherFortressPiecesAccessor {
+}

common/src/main/java/org/dimdev/dimdoors/mixin/NetherFortressPiecesMixin.java

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+package org.dimdev.dimdoors.mixin;
+
+import net.minecraft.core.Direction;
+import net.minecraft.util.RandomSource;
+import net.minecraft.world.level.levelgen.structure.StructurePieceAccessor;
+import net.minecraft.world.level.levelgen.structure.structures.NetherFortressPieces;
+import org.dimdev.dimdoors.world.feature.NetherPiecesRegistry;
+import org.dimdev.dimdoors.world.structure.NetherGatewayPiece;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.Mutable;
+import org.spongepowered.asm.mixin.gen.Accessor;
+import org.spongepowered.asm.mixin.injection.At;
+import org.spongepowered.asm.mixin.injection.Inject;
+import org.spongepowered.asm.mixin.injection.callback.CallbackInfoReturnable;
+
+import java.util.Arrays;
+
+@Mixin(NetherFortressPieces.class)
+public class NetherFortressPiecesMixin implements NetherPiecesRegistry {
+    @Inject(method = "findAndCreateBridgePieceFactory", at = @At("HEAD"), cancellable = true)
+    private static void findAndCreateBridgePieceFactory(NetherFortressPieces.PieceWeight weight, StructurePieceAccessor pieces, RandomSource random, int x, int y, int z, Direction orientation, int genDepth, CallbackInfoReturnable<NetherFortressPieces.NetherBridgePiece> cir) {
+        if (weight.pieceClass == NetherGatewayPiece.class) {
+            cir.setReturnValue(NetherGatewayPiece.createPieces(pieces, x, y, z, genDepth, orientation));
+        }
+    }
+}

common/src/main/java/org/dimdev/dimdoors/world/ModStructures.java

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+package org.dimdev.dimdoors.world;public class ModStructures {
+}

common/src/main/java/org/dimdev/dimdoors/world/feature/NetherPiecesRegistry.java

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+package org.dimdev.dimdoors.world.feature;
+