Add syntax theme selector

lib/config.js

@@ -12,7 +12,8 @@ const defaultConfig = {
   'preview-font-size': '14',
   'preview-font-family': 'Lato',
   'switch-preview': 'blur',
-  'disable-direct-write': false
+  'disable-direct-write': false,
+  'theme-syntax': 'xcode'
 }
 const configFile = 'config.json'
 
@@ -76,4 +77,3 @@ app.on('ready', function () {
     applyConfig()
   })
 })
-

lib/main.html

@@ -56,6 +56,7 @@
   <div id="content"></div>
 
   <script src="../submodules/ace/src-min/ace.js"></script>
+  <script src="../submodules/ace/src-min/ext-themelist.js"></script>
   <script src="../resources/katex.min.js"></script>
   <script type='text/javascript'>
     const electron = require('electron')