Add new command to generate the minimal ini file

A new command to generate the minimal ini file could be usefull

For example, the command mcm (My Config Minimized):

• eole3 --config custom-socle.ini mcm socle
  Generates a minimal-custom-socle.ini file with only custom parameters

• eole3 --config custom-socle.ini mcm addon -n gitea --config custom-gitea.ini
  Generates a minimal-custom-gitea.ini file with only addon custom parameters

Document this :

• Socle config
  • Generate entire socle.ini file with eole3 config socle -o socle.ini
  • Modify the socle.ini with your own values
  • Generate the minimal-socle.ini file with eole3 --config socle.ini mcm socle -o minimal-socle.ini
• Addon
  • Generate entire <my-addon>.ini file with eole3 config addon -n <my-addon> -o <my-addon>.ini
  • Modify the <my-addon>.ini with your own values
  • Generate the minimal-<my-addon>.ini file with eole3 mcm addon -n <my-addon> --config <my-addon>.ini -o minimal-<my-addon>.ini
• Admin-tool
  • Generate entire <my-admin-tool>.ini file with eole3 config admin-tool -n <my-admin-tool> -o <my-admin-tool>.ini
  • Modify the <my-admin-tool>.ini with your own values
  • Generate the minimal-<my-admin-tool>.ini file with eole3 mcm admin-tool -n <my-admin-tool> --config <my-admin-tool>.ini -o minimal-<my-admin-tool>.ini