Add classes related to the client-server connection. Added code to Client class. Added a Stopwatch class.
Revert "Add classes related to the client-server connection. Added code to Client class. Added a Stopwatch class."

This reverts commit 38675be6abdb8dc5b1bb69dcda9d018cb9fc1856.
Revert "Revert "Add classes related to the client-server connection. Added code to Client class. Added a Stopwatch class.""

This reverts commit 721313fb828bc9a1847d631df5b98206516dd94d.
Merge branch 'master' of https://github.com/GeoYS/revolution.git