added stdPr and stdContent to table of contents

src/file/table-of-contents/alias.ts

@@ -0,0 +1,12 @@
+import { XmlAttributeComponent, XmlComponent } from "file/xml-components";
+
+class AliasAttributes extends XmlAttributeComponent<{ alias: string }> {
+    protected xmlKeys = { alias: "w:val" };
+}
+
+export class Alias extends XmlComponent {
+    constructor(alias: string) {
+        super("w:alias");
+        this.root.push(new AliasAttributes({ alias }));
+    }
+}