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/app/mail/repos.go

@@ -0,0 +1,27 @@
+package mail
+
+import (
+	"context"
+	"github.com/h44z/wg-portal/internal/domain"
+	"io"
+)
+
+type Mailer interface {
+	Send(ctx context.Context, subject, body string, to []string, options *domain.MailOptions) error
+}
+
+type ConfigFileManager interface {
+	GetInterfaceConfig(ctx context.Context, id domain.InterfaceIdentifier) (io.Reader, error)
+	GetPeerConfig(ctx context.Context, id domain.PeerIdentifier) (io.Reader, error)
+	GetPeerConfigQrCode(ctx context.Context, id domain.PeerIdentifier) (io.Reader, error)
+}
+
+type UserDatabaseRepo interface {
+	GetUser(ctx context.Context, id domain.UserIdentifier) (*domain.User, error)
+}
+
+type WireguardDatabaseRepo interface {
+	GetInterfaceAndPeers(ctx context.Context, id domain.InterfaceIdentifier) (*domain.Interface, []domain.Peer, error)
+	GetPeer(ctx context.Context, id domain.PeerIdentifier) (*domain.Peer, error)
+	GetInterface(ctx context.Context, id domain.InterfaceIdentifier) (*domain.Interface, error)
+}