Added Block.getPistonMoveReaction, BlockPistonExtend and BlockPistonRetractEvent

By: Erik Broes <erikbroes@grum.nl>

paper-api/src/main/java/org/bukkit/block/Block.java

@@ -66,6 +66,15 @@ public interface Block {
      */
     Block getRelative(BlockFace face);
 
+    /**
+     * Gets the block at the given offsets
+     *
+     * @param face face
+     * @param distance distance
+     * @return Block at the given offset and distance
+     */
+    Block getRelative(BlockFace face, int distance);
+
     /**
      * Gets the type of this block
      *
@@ -268,4 +277,11 @@ public interface Block {
      * @return Humidity of this block
      */
     double getHumidity();
+
+    /**
+     * Returns the reaction of the block when moved by a piston
+     *
+     * @return reaction
+     */
+    PistonMoveReaction getPistonMoveReaction();
 }