ISPConfig CLI command
Implement a new modular ISPConfig command-line interface. The command will be named "ispc". It will also replace the old update command, ispconfig_update.sh.
Example commands:
ispc version (Shows ISPConfig version) ispc update (Runs ISPConfig Update) ispc backup (Make a backup of the ISPConfig database and files) ispc password admin (set new password for user admin) ispc server plugin enable cron (enables the cron server plugin) ispc help (Will show available modules and command options)
In the first step, the basis for the new cli will be implemented with a few simple base functions like the version command. More commands will be added later on.