Implementing private messages in lobby chat, ticket #12. Some cosmetic improvements are still missing.

docs/pokerth.asn1

@@ -669,7 +669,8 @@ ChatMessage ::= [APPLICATION 130] SEQUENCE {
 		chatTypeLobby			[0] ChatTypeLobby,
 		chatTypeGame			[1] ChatTypeGame,
 		chatTypeBot				[2] ChatTypeBot,
-		chatTypeBroadcast		[3] ChatTypeBroadcast
+		chatTypeBroadcast		[3] ChatTypeBroadcast,
+		chatTypePrivate			[4] ChatTypePrivate
 	},
 	chatText					UTF8String (SIZE(1..128))
 }
@@ -689,6 +690,10 @@ ChatTypeBroadcast ::= SEQUENCE {
 ChatTypeBot ::= SEQUENCE {
 }
 
+ChatTypePrivate ::= SEQUENCE {
+	playerId					NonZeroId
+}
+
 DialogMessage ::= [APPLICATION 131] SEQUENCE {
 	notificationText			UTF8String (SIZE(1..128))
 }