Added isEmpty to BlockChangeDelegate - this implements BUKKIT-868. Also changed version to 1.2.2-R0.1-SNAPSHOT for the upcoming beta.

By: Nathan Adams <dinnerbone@dinnerbone.com>

paper-api/src/main/java/org/bukkit/BlockChangeDelegate.java

@@ -46,4 +46,14 @@ public interface BlockChangeDelegate {
      * @return Height of the world
      */
     public int getHeight();
+
+    /**
+     * Checks if the specified block is empty (air) or not.
+     *
+     * @param x X coordinate
+     * @param y Y coordinate
+     * @param z Z coordinate
+     * @return True if the block is considered empty.
+     */
+    public boolean isEmpty(int x, int y, int z);
 }