Ship resource files in the plugin bundle

Can Dplug support having custom files in the plugin bundle?

For reference, VST3. The organization is identical to the macOS bundle.
https://developer.steinberg.help/pages/viewpage.action?pageId=9798275

eg. plugin.json
`"resourceDirs": ["resources"]`

Start with the linked VST3 reference and its example plugin.json resourceDirs entry, then compare that organization with the macOS bundle structure described in the issue. Done means custom files such as resources/plugin.json are included in the generated plugin bundle according to the requested resource directory configuration.

Written by the indexing model from the issue text.