define new keyboard "Hecomi" (#5147)

define new keyboard "Hecomi" (#5147)

* update pinout for matrix

* first commit

* include split_common.h

* change split_common.h to split_util.h

* update config.h

* update keymap & config

* update

* remove K70, add K77

* fixed test keymap

* add Layer

* define to HHKB pro 2 based keymap

* change authoer name

* define LAYOUT and LAYOUT_KC

* replace from LAYOUT_KC to LAYOUT

* change name hecomi_alpha to hecomi/alpha

* fixed hecomi_alpha to hecomi/alpha

* remove unnecessary files

* update readme

* add DEFAULT_FOLDER

* remove hecomi_alpha because change name to hecomi

* remove bad LAYOUT macro

* remove IS_COMMAND macro

* remove unnecessary RGB options

* Update keyboards/hecomi/hecomi.h

Co-Authored-By: takashiski <takashiskibb@gmail.com>
* Update keyboards/hecomi/hecomi.h

Co-Authored-By: takashiski <takashiskibb@gmail.com>
* Update keyboards/hecomi/alpha/rules.mk

Co-Authored-By: takashiski <takashiskibb@gmail.com>
* Update keyboards/hecomi/alpha/rules.mk

Co-Authored-By: takashiski <takashiskibb@gmail.com>
* Update keyboards/hecomi/hecomi.h

Co-Authored-By: takashiski <takashiskibb@gmail.com>
* remove endif

* update rule.mk with suggestions