Cordova 7 breaks npm install if any declared plugin doesn't contain package.json

As of Cordova 7, plugins declared in config.xml are automatically added to dependencies in package.json on prepare. This limits Cordova 7 projects to plugins that are also node packages, as the npm install process will break if any declared dependency does not contain a valid package.json (see related npm error).

Quite a few functioning Cordova plugins (e.g. CordovaClipboard, PrivacyScreen) live on GitHub and don't contain a package.json. In order to use such plugins in conjunction with Cordova 7 without breaking npm install, we must omit the plugin declarations from config.xml and commit the contents of the /plugins directory.

To be clear, this is not a malfunction of the Cordova CLI. Rather, this is a side-effect of the automated mirroring of config.xml and package.json configuration in Cordova 7.