Fix #81 & #82 - Integrate CMake & reorganize file structure & Update Build guide

Add Clang format & Clang tidy files

Check writeBuffer size before socket write in tcpClient

Morteza/threads

Objective:
    Automatically closing a connection, which becomes stalled for some reason.

Implementation Details:
    Before every read/write operation, a timer (`deadline_timer`) gets
    started/reseted, and after each successful I/O; the timer gets cancelled.
    When timer's handlers called ,in case of an expiration, it closes associated
    socket with the connection; by doing so, any blocking I/O on respected socket
    will be interrupted.

    This patch only addresses *TCPConnection* and *TCPClient* classes' read and write
    methods. The underlying implementation is identical for both classes.

Fixes #79

Details:
    - Decreasing the timeout value range to 2 bytes.
    - Using seconds instead of miliseconds for timeout indication.
    - Removing unused variable and a couple of variable renaming.

Timeout implementation for connections.

…ket to indicate EOF before close

use transfer_at_least(1) instead of transfer_exactly(1), shutdown soc…

add socketShutdown function to make it simple and exception handling

Morteza/debian

Nipovpn issue 94

update readme

add dev-prerelease

fix boost dep version