Simplify shortcuts. Go Back menu item

Fixes #585

main/shortcuts.js

@@ -1,26 +1,11 @@
 module.exports = {
-  init,
   onPlayerClose,
   onPlayerOpen
 }
 
 var electron = require('electron')
-
-var menu = require('./menu')
 var windows = require('./windows')
 
-function init () {
-  var localShortcut = require('electron-localshortcut')
-
-  // Alternate shortcuts. Most shortcuts are registered in menu,js, but Electron
-  // does not support multiple shortcuts for a single menu item.
-  localShortcut.register('CmdOrCtrl+Shift+F', menu.toggleFullScreen)
-  localShortcut.register('Space', () => windows.main.send('dispatch', 'playPause'))
-
-  // Hidden shortcuts, i.e. not shown in the menu
-  localShortcut.register('Esc', () => windows.main.send('dispatch', 'escapeBack'))
-}
-
 function onPlayerOpen () {
   // Register special "media key" for play/pause, available on some keyboards
   electron.globalShortcut.register(