error fix + embedding extensability (#110)

* embed mode: make embedding options more extensible
ui: unify service worker not available errors, show same error in standard/embed mode, including when loaded over http
- more customizations for extended embed, allow hiding 'browse contents' button
- simplify title updates
- make error page / icon more customizable
- autoupdating in editable mode: don't update if previous one didn't finish, make customizable, don't autoupdate at all over >=100 pages

* dependencies: update ruffle to 2022-07-02

* bump to 1.6.1, update CHANGELIST

src/pageutils.js

@@ -1,5 +1,11 @@
 import { register } from "register-service-worker";
 
+let appName = "ReplayWeb.page";
+
+// ===========================================================================
+function setAppName(newAppName) {
+  appName = newAppName;
+}
 
 // ===========================================================================
 function registerSW(name = "sw.js", scope = "./") {
@@ -10,10 +16,9 @@ function registerSW(name = "sw.js", scope = "./") {
     reject = rej;
   });
 
-  if (!navigator.serviceWorker) {
-    const errMsg = `Sorry, ReplayWeb.page won't work in this browser as Service Workers are not supported.
-Please try a different browser.
-(Service Workers are disabled in Firefox in Private Mode. If Using Private Mode in Firefox, try regular mode)`;
+  const errMsg = getSWErrorMsg();
+
+  if (errMsg) {
     console.error(errMsg);
     reject(errMsg);
   }
@@ -27,13 +32,27 @@ Please try a different browser.
 
     error (error) {
       console.error("Error during service worker registration:", error);
-      reject(`ReplayWeb.page could not be loaded due to the following error:\n${error.toString()}`);
+      reject(`${appName} could not be loaded due to the following error:\n${error.toString()}`);
     }
   });
 
   return p;
 }
 
+function getSWErrorMsg() {
+  if (navigator.serviceWorker) {
+    return null;
+  }
+  if (window.location.protocol === "http:") {
+    return `\
+Sorry, the ${appName} system must be loaded from an HTTPS URL, but was loaded from: ${window.location.host}.
+Please try loading this page from an HTTPS URL`;
+  } else {
+    return `Sorry, ${appName} won't work in this browser as Service Workers are not supported.
+Please try a different browser.
+(Service Workers are disabled in Firefox in Private Mode. If Using Private Mode in Firefox, try regular mode)`;
+  }
+}
 
 // ===========================================================================
 async function digestMessage(message, hashtype) {
@@ -137,4 +156,4 @@ function parseURLSchemeHostPath(url) {
 
 
 export { digestMessage, tsToDate, getTS, getPageDateTS, getReplayLink, sourceToId, parseURLSchemeHostPath,
-  registerSW };
+  registerSW, getSWErrorMsg, setAppName };