runelite-api: make HashTable a generic

runelite-api/src/main/java/net/runelite/api/Client.java

@@ -692,7 +692,7 @@ public interface Client extends GameEngine
 	 * @return the widget node component table
 	 * @see WidgetNode
 	 */
-	HashTable getComponentTable();
+	HashTable<WidgetNode> getComponentTable();
 
 	/**
 	 * Gets an array of current grand exchange offers.

runelite-api/src/main/java/net/runelite/api/HashTable.java

@@ -30,7 +30,7 @@ import java.util.Collection;
  * A data structure that uses a hash function to compute an index into an
  * array of buckets from which node objects can be quickly obtained.
  */
-public interface HashTable
+public interface HashTable<T extends Node>
 {
 	/**
 	 * Gets a node by its hash value.
@@ -38,12 +38,12 @@ public interface HashTable
 	 * @param value the node value
 	 * @return the associated node
 	 */
-	Node get(long value);
+	T get(long value);
 
 	/**
 	 * Gets a collection of all nodes stored in this table.
 	 *
 	 * @return the nodes stored
 	 */
-	Collection<Node> getNodes();
+	Collection<T> getNodes();
 }