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/lib/licenses.js

@@ -1,8 +1,8 @@
 export default {
     getLicense: () => {
-        return process.env.LICENSE;
+        return __EZBOOKKEEPING_LICENSE__; // eslint-disable-line
     },
     getThirdPartyLicenses: () => {
-        return process.env.THIRD_PARTY_LICENSES || [];
+        return __EZBOOKKEEPING_THIRD_PARTY_LICENSES__ || []; // eslint-disable-line
     }
 };