Defines a user for subsequent interaction.

inputUserEmpty#b98886cf = InputUser;
inputUserSelf#f7c1b13f = InputUser;
inputUser#f21158c6 user_id:long access_hash:long = InputUser;
inputUserFromMessage#1da448e2 peer:InputPeer msg_id:int user_id:long = InputUser;


Constructor Description
inputUserEmpty Empty constructor, does not define a user.
inputUserSelf Defines the current user.
inputUser Defines a user for further interaction.
inputUserFromMessage Defines a min user that was seen in a certain message of a certain chat.