Add psd preview support (#15078)

* Add psd preview support

* Adding required vendor files

* Adding oov/psd license to NOTICE.txt file

* Adding the license notice for gopherjs to the NOTICE.txt

Co-authored-by: Mattermod <mattermod@users.noreply.github.com>

app/file.go

@@ -24,6 +24,7 @@ import (
 	"time"
 
 	"github.com/disintegration/imaging"
+	_ "github.com/oov/psd"
 	"github.com/rwcarlsen/goexif/exif"
 	_ "golang.org/x/image/bmp"
 	_ "golang.org/x/image/tiff"