Update build scripts for new process

We have to convert *something* to TypeScript so it doesn't complain that there's nothing to compile, so this converts the easiest utility library.

Many of the scripts are copied from the react-sdk.

src/vector/url_utils.ts

@@ -0,0 +1,46 @@
+/*
+Copyright 2018 New Vector Ltd
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+import * as qs from 'querystring';
+
+// We want to support some name / value pairs in the fragment
+// so we're re-using query string like format
+//
+// returns {location, params}
+export function parseQsFromFragment(location) {
+    // if we have a fragment, it will start with '#', which we need to drop.
+    // (if we don't, this will return '').
+    const fragment = location.hash.substring(1);
+
+    // our fragment may contain a query-param-like section. we need to fish
+    // this out *before* URI-decoding because the params may contain ? and &
+    // characters which are only URI-encoded once.
+    const hashparts = fragment.split('?');
+
+    const result = {
+        location: decodeURIComponent(hashparts[0]),
+        params: {},
+    };
+
+    if (hashparts.length > 1) {
+        result.params = qs.parse(hashparts[1]);
+    }
+    return result;
+}
+
+export function parseQs(location) {
+    return qs.parse(location.search.substring(1));
+}