Ongoing work on the interactive prompt for gathering authentication
credentials for `rlx`.
Updates to the rlx(1) documentation.
Refactored the rlx(1) code into a shared common file and commands into
separate command files including validating that the command file
exists.
Refactoring to use aes256-cbc to encrypt the auth file.
Work on the rlx(1) auth master password handling.
Ongoing work on the rlx(1) authentication and password handling.
Added verification that stdin , stdout and stderr are a tty when
attempting to run rlx(1) with the shell command.