keymap for 1upkeyboards/sweet16 multilayers rgb lighting and tapdance (#4208)

keymap for 1upkeyboards/sweet16 multilayers rgb lighting and tapdance (#4208)

* keymap for 1upkeyboards/sweet16 multilayers rgb lighting and tapdance

* Update config.h

typo

* cleanup

Co-Authored-By: ridingintraffic <michael.j.fettis@gmail.com>
* layers are using layout macro
replaced the include guard (the ifndef, define, and endif at the end) with just #pragma once
changed undergrow to use layer-change-code
emoji macros are using send_hex_code_string
cleaned up the includes

* tap() removed
maxtrix_scan_user updated
conf.h cleanup