Plugin <config-file> can't modify binary plists

https://github.com/apache/cordova-lib/blob/master/cordova-common/src/util/plist-helpers.js#L27

Cordova expects plists to be in XML format, and not binary. However, it fails to apply changes silently, masking the problem. Can you please log failures to modify config files, and ideally also add support for binary plists? All plists are generated as binary in xcode projects by default, so anyone who develops a plugin and needs to modify a plist is going to hit this issue.