Feat: Add serve command to the CLI

[christoph-fricke]

This PR adds a new serve command and improves the overall UX of the CLI. All improvements/changes are listed below.
The serve command starts the web server without requiring a file path and opening the view. This command is especially useful for diagram views embedded in local documentation, since it has no other side-effects apart from starting the web server, and can be used in scripts.

• Added serve command.
• Moved previous behavior to an open command.
  • => Default command that will be used if no command is provided.
• The CLI version is no parsed from the package.json version when it is packaged. No need to update it manually...
• Added a global --port / -p option to overwrite the port used for the web server.
• Commands and options are now sorted in the help output.
• Altered descriptions for commands and options to be shorter and better align with the text of the auto generated help.
• The script name (used in the help) is now parsed dynamically (process.title) to reflect the name of the executable.
  • When a relative path is used to call the executable, the relative path is reflected in the script name.
  • Should avoid confusion in the help text if the executable is named differently. Especially since they are packaged with their OS target appended.
• Updated Commander to the latest major version

[NiklasRentzCAU]

LGTM!