Add the Request stub class
Implement interface of the Request class
Request: Implement the class's methods
Socket: Add the SendMsgClear method
Request: Initialise messages with id and host in the constructor
Client: Use object of the Request class to manage messages
RegistrarClient: Use object of the Request class to manage messages
Request: Fix bug with the message with id initialization
Request: Fix bug with sending same message in loop
ClientBase: Fix the memory leak in SetHost method
Socket: Remove the SendMsgClear method