Merge separate config file to main config.json
**Is your feature request related to a problem? Please describe.**
Having a separate config file for your plugin is hampering efforts of other plugins to easily manage their configs. For example homebridge-config-ui-x and HOOBS have a configuration editor based on the config.json file. The file is a well known file and easy to consume, and pipe the changes through an API. Your plugin uses a different file. If other plugins start to do this, it is nearly impossible to determine what file does what. It's best to define all the fields your plugin uses in the config.schema.json file.

**Describe the solution you'd like**
I would like to see these config directives merged back into the config.json file for easy management. Or have an option to use either or.

**Describe alternatives you've considered**
I looked into scanning the storage path for .json files, but this is problematic because there is not definitive correlation between the file and the plugin.

