big ui update, page search + full text

- split file chooser from coll index, insert as header, make file chooser collapsible
- revamp collection index to be responsive
- add separate sorter component, used for collection index and pages
- combine 'curated lists' + pages, with page search + narrative
- ensure page + narrative lists are collapsible
- page search: support title, url and full text search if available, using flexsearch
- page search: keyword highlighting, load all pages, showing in increments of 100
- page and resource search: delay search to 1/4 sec of inactivity to avoid too many queries
- electron app: ensure noCache is set to true for local files
- embedding: remove separate embed.js, just use ui.js for embed as well
- embedding: support embedding iframe in a local origin with just sw.js and ui.js: sw.js serves index.html,
<replay-web-page> embed injects ui.js into iframe
- sw.js, new service worker entry point
- sw and ww inited only from <replay-app-main>, ui.js loaded from <replay-web-page> embed component

src/misc.js

@@ -1,3 +1,5 @@
+"use strict";
+
 import { LitElement, html, css, unsafeCSS } from 'lit-element';
 import { unsafeSVG } from 'lit-html/directives/unsafe-svg';
 import { styleMap } from 'lit-html/directives/style-map';
@@ -15,8 +17,6 @@ function wrapCss(custom) {
 
 const IS_APP = window.electron && window.electron.IS_APP || window.matchMedia('(display-mode: standalone)').matches;
 
-const dbworker = new Worker(__SW_PATH__);
-
 
 // ===========================================================================
 class FaIcon extends LitElement
@@ -101,4 +101,4 @@ class AnimLogo extends FaIcon
 customElements.define("fa-icon",  FaIcon);
 customElements.define("wr-anim-logo", AnimLogo);
 
-export { wrapCss, IS_APP, dbworker, rwpLogo, FaIcon, AnimLogo };
+export { wrapCss, IS_APP, rwpLogo, FaIcon, AnimLogo };