added placementRotationFix mixins

src/main/java/carpet/mixins/EntityMixin.java

@@ -0,0 +1,22 @@
+package carpet.mixins;
+
+import carpet.utils.IEntity;
+import net.minecraft.entity.Entity;
+import net.minecraft.util.math.MathHelper;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.Shadow;
+
+@Mixin(Entity.class)
+public abstract class EntityMixin implements IEntity
+{
+    @Shadow
+    public float yaw;
+    
+    @Shadow
+    public float prevYaw;
+    
+    public float getMainYaw(float partialTicks)
+    {
+        return partialTicks == 1.0F ? this.yaw : MathHelper.lerp(partialTicks, this.prevYaw, this.yaw);
+    }
+}