update version to R27
basic implementation of `player.onDisconnect` event

see BigBrotherBot/big-brother-bot#169
forward `player.onDisconnect` event to EVT_CLIENT_DISCONNECT_REASON

BigBrotherBot/big-brother-bot#169
Merge pull request #170 from ozon/features/BF4_player.onDisconnect

[BF4] R27 add player.on disconnect event