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>

internal/lowlevel/wgctrl.go

@@ -0,0 +1,15 @@
+package lowlevel
+
+import (
+	"io"
+
+	"golang.zx2c4.com/wireguard/wgctrl/wgtypes"
+)
+
+// A WireGuardClient is a type which can control a WireGuard device.
+type WireGuardClient interface {
+	io.Closer
+	Devices() ([]*wgtypes.Device, error)
+	Device(name string) (*wgtypes.Device, error)
+	ConfigureDevice(name string, cfg wgtypes.Config) error
+}