[RFC] Auto-announce when new song comes on (#914)

Co-authored-by: Andrew Mike <andrew@7thmagic.net>
Co-authored-by: Andrew Mike <logomancer@gmail.com>

schema.prisma

@@ -28,6 +28,7 @@ model Setting {
   playlistLimit                  Int      @default(50)
   secondsToWaitAfterQueueEmpties Int      @default(30)
   leaveIfNoListeners             Boolean  @default(true)
+  autoAnnounceNextSong           Boolean  @default(false)
   createdAt                      DateTime @default(now())
   updatedAt                      DateTime @updatedAt
 }