The template compiler update removed the option to run the transformer
without generating change detectors and deprecated the
`generate_change_detectors` transformer parameter.
Now that it has been deprecated for several weeks, remove it from the
transformer code.
Forward `reflectPropertiesAsAttributes` => `reflect_properties_as_attributes`
and add a deprecation warning to `reflectPropertiesAsAttributes`.
Closes#4433
c9a3ba0f48