Added player.performCommand(String)

By: Dinnerbone <dinnerbone@dinnerbone.com>

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

@@ -69,4 +69,12 @@ public interface Player extends HumanEntity {
      * @return
      */
     public void kickPlayer(String message);
+
+    /**
+     * Makes the player perform the given command
+     *
+     * @param command Command to perform
+     * @return true if the command was successful, otherwise false
+     */
+    public boolean performCommand(String command);
 }