cleanup unused code and mixins

src/main/java/carpet/mixins/ChunkGenerator_scarpetMixin.java

@@ -0,0 +1,18 @@
+package carpet.mixins;
+
+import carpet.fakes.ChunkGeneratorInterface;
+import net.minecraft.world.gen.chunk.ChunkGenerator;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.Shadow;
+
+@Mixin(ChunkGenerator.class)
+public abstract class ChunkGenerator_scarpetMixin implements ChunkGeneratorInterface
+{
+    @Shadow protected abstract void generateStrongholdPositions();
+
+    @Override
+    public void initStrongholds()
+    {
+        generateStrongholdPositions();
+    }
+}