Remove matrix_key_count() from matrix.h

Fix ghost block and remove matrix_has_ghost()

Merge branch 'overlays'

Fix keymap for new framework

Fix README.md and doc/keymap.md

Clean action.h and add keymap doc

Create keymap.md

Fix SET_DEFAULT_LAYER action and keymap of gh60

Add tap flags on record_t

Fix bit shift which is beyond int size(16bit)

Fix keymap MACRO of pc98 adn hhkb

Add MACRO action

Merge branch 'pc98_fix' into overlays

Fix software serial configure

Add serial_uart.c and use it for PC98

Add parity option in serial_soft.c

Inhibit repeating key of PC98

New keymap of PC98

Merge branch 'pc98' of github.com:tmk/tmk_keyboard into overlays

Fix debug code of serial_soft.c