fix: Resolve CLI issues on Mac

[ffMathy]

• I have added automatic tests where applicable
• The PR title is suitable as a release note
• The PR contains a description of what has been changed
• The description contains manual test instructions

Changes

On Mac, the include path check did not work for me.

Context: https://stackoverflow.com/questions/6398196/detect-if-called-through-require-or-directly-by-command-line

I followed the above changes.

Test

1. Clone this repo. The following commands are then run in that repo folder.
2. Run yarn install.
3. Run npm link.
4. Run npm run watch to build and watch for changes.
5. Start another project. The following commands are then run in that project.
6. Install @ftrack/ts-schema-generator into the project from NPM.
7. Run npm link @ftrack/ts-schema-generator to symbiotically link the project's ts-schema-generator to the repo's folder.
8. Execute the generator via the following scripts command: "ftrack:schema": "ftrack-ts-schema-generator ./ftrack schema.ts"

[ffMathy]

By the way, this is the pull request I was describing: ftrackhq/ftrack-javascript#97

[gismya]

I removed the export from the generate function and ran the prettier formatting

[ffMathy]

Ah yes. I always forget that 😂 thanks! 🙏