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>

config.yml.sample

@@ -0,0 +1,47 @@
+advanced:
+  log_level: trace
+
+core:
+  admin_user: test@test.de
+  admin_password: secret
+
+web:
+  external_url: http://localhost:8888
+  request_logging: true
+
+auth:
+  callback_url_prefix: http://localhost:8888/api/v0
+  ldap:
+    - id: ldap1
+      provider_name: company ldap
+      display_name: Login with</br>LDAP
+      url: ldap://ldap.yourcompany.local:389
+      bind_user: ldap_wireguard@yourcompany.local
+      bind_pass: super_Secret_PASSWORD
+      base_dn: DC=YOURCOMPANY,DC=LOCAL
+      login_filter: (&(objectClass=organizationalPerson)(mail={{login_identifier}})(!userAccountControl:1.2.840.113556.1.4.803:=2))
+      admin_group: CN=WireGuardAdmins,OU=it,DC=YOURCOMPANY,DC=LOCAL
+      synchronize: false
+      sync_filter: (&(objectClass=organizationalPerson)(!userAccountControl:1.2.840.113556.1.4.803:=2)(mail=*))
+      registration_enabled: true
+  oidc:
+    - id: oidc1
+      provider_name: google
+      display_name: Login with</br>Google
+      base_url: https://accounts.google.com
+      client_id: the-client-id-1234.apps.googleusercontent.com
+      client_secret: A_CLIENT_SECRET
+      extra_scopes:
+        - https://www.googleapis.com/auth/userinfo.email
+        - https://www.googleapis.com/auth/userinfo.profile
+      registration_enabled: true
+    - id: oidc2
+      provider_name: google2
+      display_name: Login with</br>Google2
+      base_url: https://accounts.google.com
+      client_id: another-client-id-1234.apps.googleusercontent.com
+      client_secret: A_CLIENT_SECRET
+      extra_scopes:
+        - https://www.googleapis.com/auth/userinfo.email
+        - https://www.googleapis.com/auth/userinfo.profile
+      registration_enabled: true