Consider implementing the various version bumps as `commands` and/or change to spectre.console

[nover]

Look here: https://www.areilly.com/2017/04/21/command-line-argument-parsing-in-net-core-with-microsoft-extensions-commandlineutils/

The CommandLineApplication has sub-command support, and I guess that our different version bumps are actually sub-commands.

[nover]

updated the title.

There might be some gains in rewriting the internals of the app to use Spectre.Console. Gives us nicer output as well as a structured / opinionated way of handing the command line parsing.

https://github.com/spectresystems/spectre.console

[nover]

https://spectreconsole.net/cli/commandapp