flag(Core): Add flag -d; Dynamically set displayed information

[KittyKatt]

Old screenFetch functionality:

   -d  '+var;-var;var' Allows for setting what information is displayed
                      on the command line. You can add displays with +var,var. You
                      can delete displays with -var,var. Setting without + or - will
                      set display to that explicit combination. Add and delete statements
                      may be used in conjunction by placing a ; between them as so:
                      +var,var,var;-var,var. See above to find supported display names.

This flag allowed for dynamically setting the displayed information upon execution. With the introduction of a configuration file and ${config_global[info]}, I'm not entirely sure this is necessary but for completion's sake, I'm creating this issue.

This is optional.