runelite-api: add setVar for setting varclientstr

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

@@ -625,6 +625,14 @@ public interface Client extends GameEngine
 	 */
 	String getVar(VarClientStr varClientStr);
 
+	/**
+	 * Sets the given variable
+	 *
+	 * @param varClientStr
+	 * @param value
+	 */
+	void setVar(VarClientStr varClientStr, String value);
+
 	/**
 	 * Sets the value of a given variable.
 	 *