Migrate the Carpet codebase to Mojang Mappings

src/main/java/carpet/mixins/BlockEntity_movableBEMixin.java

@@ -1,8 +1,8 @@
 package carpet.mixins;
 
 import carpet.fakes.BlockEntityInterface;
-import net.minecraft.block.entity.BlockEntity;
-import net.minecraft.util.math.BlockPos;
+import net.minecraft.core.BlockPos;
+import net.minecraft.world.level.block.entity.BlockEntity;
 import org.spongepowered.asm.mixin.Final;
 import org.spongepowered.asm.mixin.Mixin;
 import org.spongepowered.asm.mixin.Mutable;
@@ -12,10 +12,10 @@ import org.spongepowered.asm.mixin.Shadow;
 public abstract class BlockEntity_movableBEMixin implements BlockEntityInterface
 {
     @Mutable
-    @Shadow @Final protected BlockPos pos;
+    @Shadow @Final protected BlockPos worldPosition;
 
     public void setCMPos(BlockPos newPos)
     {
-        pos = newPos;
+        worldPosition = newPos;
     };
 }