feat(subsonic): add avatar support

closes: #228

server/ctrladmin/ctrl.go

@@ -2,6 +2,7 @@
 package ctrladmin
 
 import (
+	"encoding/base64"
 	"encoding/gob"
 	"errors"
 	"fmt"
@@ -21,10 +22,10 @@ import (
 	"github.com/sentriz/gormstore"
 
 	"go.senan.xyz/gonic"
-	"go.senan.xyz/gonic/server/assets"
-	"go.senan.xyz/gonic/server/ctrlbase"
 	"go.senan.xyz/gonic/db"
 	"go.senan.xyz/gonic/podcasts"
+	"go.senan.xyz/gonic/server/assets"
+	"go.senan.xyz/gonic/server/ctrlbase"
 )
 
 type CtxKey int
@@ -47,6 +48,7 @@ func funcMap() template.FuncMap {
 			return strings.ToLower(in.Format("Jan 02, 2006"))
 		},
 		"dateHuman": humanize.Time,
+		"base64":    base64.StdEncoding.EncodeToString,
 	}
 }
 
@@ -122,8 +124,11 @@ type templateData struct {
 	DefaultListenBrainzURL string
 	SelectedUser           *db.User
 
-	Podcasts []*db.Podcast
+	Podcasts              []*db.Podcast
 	InternetRadioStations []*db.InternetRadioStation
+
+	// avatar
+	Avatar []byte
 }
 
 type Response struct {