Add distinct random hand reveals with private recipient delivery

libcockatrice_protocol/libcockatrice/protocol/pb/game_commands.proto

@@ -180,6 +180,11 @@ message GameCommand {
         /// Server: Server_Player::cmdSetPlaymat
         /// Client: reflected via player properties changed event
         SET_PLAYMAT = 1035;
+
+        /// Reveal a distinct random sample without exposing identities to other recipients.
+        /// Server: Server_AbstractPlayer::cmdRevealCards
+        /// Client: PlayerEventHandler::eventRevealCards
+        REVEAL_RANDOM_CARDS = 1036;
     }
 
     extensions 100 to max;