Painting improvements. Thanks CelticMinstrel!

Added interface to get/set the art and facing direction on paintings, and expanded painting break events to catch more cases (including fire and lightning); removed PaintingBreakByWorldEvent since it's identical to its superclass

By: EvilSeph <evilseph@gmail.com>

paper-api/src/main/java/org/bukkit/entity/Painting.java

@@ -1,12 +1,42 @@
-/**
- *
- */
 package org.bukkit.entity;
 
+import org.bukkit.Art;
+import org.bukkit.block.BlockFace;
+import org.bukkit.material.Attachable;
+
 /**
  * Represents a Painting.
- *
- * @author Cogito
- *
  */
-public interface Painting extends Entity {}
+public interface Painting extends Entity, Attachable {
+    /**
+     * Get the art on this painting
+     * @return The art
+     */
+    public Art getArt();
+
+    /**
+     * Set the art on this painting
+     * @param art The new art
+     * @return False if the new art won't fit at the painting's current location
+     */
+    public boolean setArt(Art art);
+
+    /**
+     * Set the art on this painting
+     * @param art The new art
+     * @param force If true, force the new art regardless of whether it fits at the current location
+     * Note that forcing it where it can't fit normally causes it to drop as an item unless you override
+     * this by catching the PAINTING_BREAK event.
+     * @return False if force was false and the new art won't fit at the painting's current location
+     */
+    public boolean setArt(Art art, boolean force);
+
+    /**
+     * Sets the direction of the painting, potentially overriding rules of placement. Note that if the result
+     * is not valid the painting would normally drop as an item.
+     * @param face The new direction.
+     * @param force Whether to force it.
+     * @return False if force was false and there was no block for it to attach to in order to face the given direction.
+     */
+    public boolean setFacingDirection(BlockFace face, boolean force);
+}