Allow templating in hash params

Some contexts, like Webviews, don't have a traditional document.location, or
don't allow it to be easily set.

In those contexts, allow templating in the hash params

Author: jpolitz

src/web/editor.html

@@ -32,8 +32,16 @@
     var themeOnLoad = localSettings.getItem('theme') || 'default';
     document.body.classList.remove("default");
     document.body.classList.add(themeOnLoad);
+    var optionalTemplatedHash = "{{ &HASH_OPTIONS }}";
     var params = {};
-    document.location.hash.substr(1).split("&").forEach(function (p) {
+    let hash;
+    if(optionalTemplatedHash !== "") {
+      hash = optionalTemplatedHash;
+    }
+    else {
+      hash = document.location.hash;
+    }
+    hash.substr(1).split("&").forEach(function (p) {
       var parts = p.split("=");
       if (parts.length === 1) {
         params[parts[0]] = true;