* add notice to files being removed
* add gin version of function_template.h
* rename callback.h to avoid confliction
* add gin version of callback_converter
* add gin converter for OnceCallback
* remove callback_converter_gin_adapter.h
* remove gin_util.h and gin_utils.h
* fix lint warning
* add helper for setting methods
* feat: add new nativeTheme API
* chore: deprecate and clean up old systemPreferences theme APIs in favor of new nativeTheme module
* chore: clean up and deprecate things per feedback
* chore: add tests for deprecate and clean up invert impl
* build: when is a boolean not a boolean???