Add meta-shell commands for reverse shell session

Shell sessions typically expose a direct connection to a remote shell, but are lacking a number of nice features such as the ability to stop a remote command, background a command (this could be advanced or depend on the underlying session), or to even lock the session. This project would implement some pre-processing hooks to shell sessions so that job control could be added by default (allowing backgrounding of commands), meta-commands like 'background' and 'sessions' could be added as well., This idea will upgrade shell session to meterpreter shell and make shell session more friendly to users.