Everywhere: Hoist the Libraries folder to the top-level

Author: https://github.com/trflynn89
Commit: 93712b24bf
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/2256
Reviewed-by: https://github.com/sideshowbarker

Libraries/LibWeb/HTML/HTMLOptionsCollection.idl

@@ -0,0 +1,13 @@
+#import <DOM/HTMLCollection.idl>
+#import <HTML/HTMLOptionElement.idl>
+#import <HTML/HTMLOptGroupElement.idl>
+
+// https://html.spec.whatwg.org/#htmloptionscollection
+[Exposed=Window]
+interface HTMLOptionsCollection : HTMLCollection {
+    [CEReactions] attribute unsigned long length; // shadows inherited length
+    // [CEReactions] setter undefined (unsigned long index, HTMLOptionElement? option);
+    [CEReactions] undefined add((HTMLOptionElement or HTMLOptGroupElement) element, optional (HTMLElement or long)? before = null);
+    [CEReactions] undefined remove(long index);
+    attribute long selectedIndex;
+};