Add ns.ui.clearTerminal for 0.2 GB

src/ScriptEditor/NetscriptDefinitions.d.ts

@@ -4391,6 +4391,13 @@ interface UserInterface {
    * RAM cost: 0 GB
    */
   getGameInfo(): GameInfo;
+
+  /**
+   * Clear the Terminal window, as if the player ran `clear` in the terminal
+   * @remarks
+   * RAM cost: 0 GB
+   */
+  clearTerminal(): void;
 }
 
 /**