[Keyboard] Adds support for BM16S keyboard (#5659)

[Keyboard] Adds support for BM16S keyboard (#5659)

* Added support for BM16S keyboard.

* Update keyboards/bm16s/bm16s.h

Co-Authored-By: bontakun <ben@bontakun.net>
* Update keyboards/bm16s/bm16s.h

Co-Authored-By: bontakun <ben@bontakun.net>
* Cleaned up a bunch of unneeded stuff.

* Made layout name match.

* Changed rules file to have correct bootloader and indention. Updated readme to reflect availability on krepublic. Updated keymap to have more obvious RGB controls.

* Removed unnecessary file.

* Fixed grammar in readme.

Co-Authored-By: bontakun <ben@bontakun.net>
* Migrated to autogenerated layout config, without issue.

* Renamed LAYOUT to match community standards.