Add three Structure Block related settings (#664)

* Added structureBlockOutlineDistance

* Added structureBlockIgnored

* Added structureBlockLimit

* Made structureBlockLimit work on dedicated server

* Correct packet contents check and fix mixin list

* Add limits to structure block settings, slight optimisation to ignored block

* Fixed the `structureBlockLimit` limit

* Update src/main/java/carpet/CarpetSettings.java

Co-authored-by: altrisi <altrisi.trillosierra@gmail.com>

* Fix missing imports and a typo

* Update src/main/java/carpet/CarpetSettings.java

Co-authored-by: gnembon <41132274+gnembon@users.noreply.github.com>
Co-authored-by: altrisi <altrisi.trillosierra@gmail.com>

src/main/java/carpet/mixins/UpdateStructureBlockC2SPacketMixin.java

@@ -0,0 +1,45 @@
+package carpet.mixins;
+
+import carpet.CarpetSettings;
+import net.minecraft.network.PacketByteBuf;
+import net.minecraft.network.packet.c2s.play.UpdateStructureBlockC2SPacket;
+import net.minecraft.util.math.BlockPos;
+import net.minecraft.util.math.MathHelper;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.Shadow;
+import org.spongepowered.asm.mixin.injection.At;
+import org.spongepowered.asm.mixin.injection.Inject;
+import org.spongepowered.asm.mixin.injection.callback.CallbackInfo;
+
+@Mixin(UpdateStructureBlockC2SPacket.class)
+public class UpdateStructureBlockC2SPacketMixin {
+    @Shadow
+    private BlockPos offset;
+    @Shadow
+    private BlockPos size;
+
+    @Inject(
+            method = "read",
+            at = @At("TAIL")
+    )
+    private void structureBlockLimitsRead(PacketByteBuf buf, CallbackInfo ci) {
+        if (buf.readableBytes() > 0) {
+            // This will throw an exception if carpet is not installed on client
+            offset = new BlockPos(MathHelper.clamp(buf.readInt(), -CarpetSettings.structureBlockLimit, CarpetSettings.structureBlockLimit), MathHelper.clamp(buf.readInt(), -CarpetSettings.structureBlockLimit, CarpetSettings.structureBlockLimit), MathHelper.clamp(buf.readInt(), -CarpetSettings.structureBlockLimit, CarpetSettings.structureBlockLimit));
+            size = new BlockPos(MathHelper.clamp(buf.readInt(), 0, CarpetSettings.structureBlockLimit), MathHelper.clamp(buf.readInt(), 0, CarpetSettings.structureBlockLimit), MathHelper.clamp(buf.readInt(), 0, CarpetSettings.structureBlockLimit));
+        }
+    }
+
+    @Inject(
+            method = "write",
+            at = @At("TAIL")
+    )
+    private void structureBlockLimitsWrite(PacketByteBuf buf, CallbackInfo ci) {
+        buf.writeInt(this.offset.getX());
+        buf.writeInt(this.offset.getY());
+        buf.writeInt(this.offset.getZ());
+        buf.writeInt(this.size.getX());
+        buf.writeInt(this.size.getY());
+        buf.writeInt(this.size.getZ());
+    }
+}