Propagate FAWE diff annotations down the bukkit module

- Minor upstream merge

worldedit-core/src/main/java/com/sk89q/worldedit/world/World.java

@@ -213,6 +213,17 @@ public interface World extends Extent, Keyed, IChunkCache<IChunkGet> {
      */
     void simulateBlockMine(BlockVector3 position);
 
+    /**
+     * Gets whether the given {@link BlockState} can be placed here.
+     *
+     * @param position The position
+     * @param blockState The blockstate
+     * @return If it can be placed
+     */
+    default boolean canPlaceAt(BlockVector3 position, BlockState blockState) {
+        return true;
+    }
+
     /**
      * Regenerate an area.
      *