Upgrade to vue3 (#16)

* upgrade to vue 3.x and framework7 8.x
* change calendar plugin to vue-datepicker
* disable export button when user does not hava any transaction
* implement new pin code input
* append thousands separator in amount in exchange rates page

src/locales/index.js

@@ -1,3 +1,5 @@
+import 'moment/dist/locale/zh-cn.js';
+
 import en from './en.js'
 import zhHans from './zh_Hans.js'