add new session manager
update .gitignore
new class: Session
update filter working model
partially implemented class Session
finished class Session
fix compilation error
fix compilation errors
enhance debug log
update class Session
update ProxyServer, use the new Session class
add interface
enhance debug log
enhance debug log
delete unused files
fix compilation error on linux using gcc
add session management class: SessionManager
update ProxyServer, add session manager
fix minor defect
update error handling logic