Remove unused code

src/main/java/com/minelittlepony/unicopia/EntitySupplier.java

@@ -1,10 +0,0 @@
-package com.minelittlepony.unicopia;
-
-import net.minecraft.entity.Entity;
-
-public interface EntitySupplier {
-    /**
-     * Gets the owner that holds this object.
-     */
-    Entity getEntity();
-}

src/main/java/com/minelittlepony/unicopia/Owned.java

@@ -46,7 +46,9 @@ public interface Owned<E extends Entity> {
     }
 
     default boolean isOwnedBy(@Nullable Object owner) {
-        return owner instanceof Entity e && getMasterId().isPresent() && e.getUuid().equals(getMasterId().get());
+        return owner instanceof Entity e
+                && getMasterId().isPresent()
+                && e.getUuid().equals(getMasterId().get());
     }
 
     default boolean hasCommonOwner(Owned<?> sibling) {

src/main/java/com/minelittlepony/unicopia/entity/EntityReference.java

@@ -51,12 +51,15 @@ public class EntityReference<T extends Entity> implements NbtSerialisable {
         }
     }
 
+    /**
+     * Gets the assigned entity's UUID
+     */
     public Optional<UUID> getId() {
         return uuid;
     }
 
     /**
-     * Gets the position the last known position of the assigned entity.
+     * Gets the last known position of the assigned entity.
      */
     public Optional<Vec3d> getPosition() {
         return pos;