feat: extractvbs script path arg

[francisdb]

closes #410

This is a breaking change as we no longer support extracting scripts from many vpx files at once.

> vpxtool extractvbs --help`
Extracts the script from a vpx file by default into a vbs file next to it. Scripts placed next to the vpx file with the same name are considered sidecar scripts and will be picked up by Visual Pinball instead of the script inside the vpx file.

Usage: vpxtool extractvbs [OPTIONS] <VPXPATH> [VBSPATH]

Arguments:
  <VPXPATH>
          The path to the vpx file

  [VBSPATH]
          The optional path to the vbs file to write. Defaults to the vpx file path with the extension changed to .vbs. This option is mutually exclusive with DIRECTORY.

Options:
  -f, --force
          Will overwrite existing .vbs file if set.

      --output-dir <OUTPUT_DIRECTORY>
          The directory to extract the vbs file to. Only if no VBSPATH is provided

  -h, --help
          Print help (see a summary with '-h')