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/directives/mobile/textareaAutoSize.js

@@ -0,0 +1,10 @@
+import { autoChangeTextareaSize } from '../../lib/mobile/ui.js';
+
+export default {
+    mounted(el) {
+        autoChangeTextareaSize(el);
+    },
+    updated(el) {
+        autoChangeTextareaSize(el);
+    }
+}