added an option to patch unheadered roms with patches that need a headered rom\nusing now service workers for webapp cache

_cache_service_worker.js

@@ -0,0 +1,30 @@
+/*
+Copyright 2016 Google Inc. All Rights Reserved.
+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.
+---
+mod by marcrobledo, original from: https://github.com/GoogleChrome/samples/blob/gh-pages/service-worker/basic/service-worker.js
+*/
+
+const PRECACHE_ID='v20180423';
+const PRECACHE_FILES=[
+'index.html','./',
+'RomPatcher.css',
+'RomPatcher.js',
+'favicon.png',
+'logo.png',
+'ips.js',
+'ups.js',
+'aps.js',
+'bps.js',
+'ByteFlipper.js'
+];
+
+
+self.addEventListener('install',event=>{event.waitUntil(caches.open(PRECACHE_ID).then(cache=>cache.addAll(PRECACHE_FILES)).then(self.skipWaiting()))});self.addEventListener('activate',event=>{const currentCaches=[PRECACHE_ID,'runtime'];event.waitUntil(caches.keys().then(cacheNames=>{return cacheNames.filter(cacheName=>!currentCaches.includes(cacheName));}).then(cachesToDelete=>{return Promise.all(cachesToDelete.map(cacheToDelete=>{return caches.delete(cacheToDelete);}))}).then(()=>self.clients.claim()))});self.addEventListener('fetch',event=>{if(event.request.url.startsWith(self.location.origin))event.respondWith(caches.match(event.request).then(cachedResponse=>{if(cachedResponse)return cachedResponse;return caches.open('runtime').then(cache=>{return fetch(event.request).then(response=>{return cache.put(event.request,response.clone()).then(()=>{return response})})})}))})