V2 alpha - initial version (#172)

Initial alpha codebase for version 2 of WireGuard Portal.
This version is considered unstable and incomplete (for example, no public REST API)! 
Use with care!


Fixes/Implements the following issues:
 - OAuth support #154, #1 
 - New Web UI with internationalisation support #98, #107, #89, #62
 - Postgres Support #49 
 - Improved Email handling #47, #119 
 - DNS Search Domain support #46 
 - Bugfixes #94, #48 

---------

Co-authored-by: Fabian Wechselberger <wechselbergerf@hotmail.com>

frontend/src/helpers/encoding.js

@@ -0,0 +1,7 @@
+export function base64_url_encode(input) {
+  let output = btoa(input)
+  output = output.replace('+', '.')
+  output = output.replace('/', '_')
+  output = output.replace('=', '-')
+  return output
+}