Drop use of = in parsing arguments in raku

There has been a lot of discussion of how command line parameters should be parsed. At the moment there are no plans of adding more functionality to what Raku provides out of the box.

If you want more tweakability, you should probably look at the Getopt::Long module by Leon Timmermans

You could also use SuperMAIN, a library for CLI processing. This add some new superpowers to MAIN