* Add support for deferred executors. * More docs. * Include from quantum.h * Cleanup. * Parameter checks * Comments. * qmk format-c * I accidentally a few words. * API name change. * Apply suggestions from code review Co-authored-by: Sergey Vlasov <sigprof@gmail.com> * Review comments. * qmk format-c * Review comments. Co-authored-by: Sergey Vlasov <sigprof@gmail.com>