clients: add NetFront Living Connect support

Add subtitle support for NetFront™ Living Connect middleware-based
clients.  These appear to include devices from Panasonic, Philips,
Vizio, Sony, and probably more.

clients.c

@@ -94,6 +94,14 @@ struct client_type_s client_types[] =
 	  EUserAgent
 	},
 
+	/* User-Agent: IPI/1.0 UPnP/1.0 DLNADOC/1.50 */
+	{ ENetFrontLivingConnect,
+	  FLAG_DLNA | FLAG_FORCE_SORT | FLAG_CAPTION_RES,
+	  "NetFront Living Connect",
+	  "IPI/1",
+	  EUserAgent
+	},
+
 	{ EDenonReceiver,
 	  FLAG_DLNA,
 	  "Denon Receiver",

clients.h

@@ -75,6 +75,7 @@ enum client_types {
 	EToshibaTV,
 	EAsusOPlay,
 	EBubbleUPnP,
+	ENetFrontLivingConnect,
 	EStandardDLNA150,
 	EStandardUPnP
 };