FileBot format templating

To generate files run:

yarn
yarn run build

If you want to see the log output use yarn run build-dbg, env DEBUG='*' yarn run build (fish shell) or equivalent in other shells. The build script expects a directory tree like the following:

.
├── README.md
├── index.js
├── package.json
├── templates
│   ├── clear_secrets.json
│   ├── movieFormat.mustache
│   ├── partials
│   │   └── audio.mustache
│   ├── secrets.json
│   ├── seriesFormat.mustache
│   └── vars.json
└── yarn.lock

with template files (including desired extension) ending in .mustache contained in templates (e.g. movieFormat.groovy.mustache) and partials ending in .mustache and contained in templates/partials. The script also requires a vars.json file and optionally a clear_secrets.json, both contained in templates. These get merged at runtime. The scripts outputs generated files into dist.