Update arg parsing to clap v3

Marcin Pucrequested to merge
tranzystorek-io/gluebuddy:clap-v3 into main

Updates arg parsing to the recently released clap 3 with the derive feature (the new structopt).

Changes in clap-derive:

  • Version is no longer propagated to all subcommands by default, only the top level help prompt has the version now
  • Help is colored by default

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