* Add GLViewImpl::setIcon and GLViewImpl::setDefaultIcon for windows and linux
* Include CCImage.h only if required
* Fix empty icon image
* Fix windows build
* [skip ci] Replace `{ return; }` with `{}`
* Add icon test to cpp-empty-test
* [skip ci] Replace TABs with spaces, add comments
* Chnage requested things, fix formatting
* Fix define
* Fix ios build