#491: Add support to change block's lid state

By: jameslfc19 <jameslfc19@gmail.com>

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

@@ -5,4 +5,4 @@ import org.bukkit.loot.Lootable;
 /**
  * Represents a captured state of a Barrel.
  */
-public interface Barrel extends Container, Lootable { }
+public interface Barrel extends Container, Lootable, Lidded { }

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

@@ -7,7 +7,7 @@ import org.jetbrains.annotations.NotNull;
 /**
  * Represents a captured state of a chest.
  */
-public interface Chest extends Container, Lootable {
+public interface Chest extends Container, Lootable, Lidded {
 
     /**
      * Gets the inventory of the chest block represented by this block state.

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

@@ -0,0 +1,16 @@
+package org.bukkit.block;
+
+public interface Lidded {
+
+    /**
+     * Sets the block's animated state to open and prevents it from being closed
+     * until {@link #close()} is called.
+     */
+    void open();
+
+    /**
+     * Sets the block's animated state to closed even if a player is currently
+     * viewing this block.
+     */
+    void close();
+}

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

@@ -7,7 +7,7 @@ import org.jetbrains.annotations.NotNull;
 /**
  * Represents a captured state of a ShulkerBox.
  */
-public interface ShulkerBox extends Container, Lootable {
+public interface ShulkerBox extends Container, Lootable, Lidded {
 
     /**
      * Get the {@link DyeColor} corresponding to this ShulkerBox