Mirror official support is integrated

• MirrorRoomManager - controls the room server and client
• MirrorRoomServer - controls all the logic of mirror room server side
• MirrorRoomClient - controls all the logic of mirror room client side
• MirrorRoomPlayer - is a holder of mirror room player info

Added Async methods to IAccountsDatabaseAccessor

• void GetAccountByUsernameAsync(string username, GetAccountCallback callback)
• void GetAccountByTokenAsync(string token, GetAccountCallback callback)
• void GetAccountByEmailAsync(string email, GetAccountCallback callback)
• void SavePasswordResetCodeAsync(IAccountInfoData account, string code, Action<string> callback)
• void GetPasswordResetDataAsync(string email, GetPasswordResetCallback callback)
• void SaveEmailConfirmationCodeAsync(string email, string code, Action<string> callback)
• void GetEmailConfirmationCodeAsync(string email, GetEmailConfirmationCodeCallback callback)
• void UpdateAccountAsync(IAccountInfoData account, Action<string> callback)
• void InsertNewAccountAsync(IAccountInfoData account, Action<string> callback)
• void InsertTokenAsync(IAccountInfoData account, string token, Action<string> callback)

Fixed token saving issue. When guest client is authenticated an empty token is saving. There was no possibility to sign in again after you stop game.