Tidy 40percentclub boards (#4403)

* Remove unnecessary re-definitions for XXXXXXX and _______

* Update 6lit to use KC_NO in layout macros

* Update rules.mk to follow current template

* Remove use of deprecated function action_get_macro - unused and contents were from old template

* Remove use of deprecated function action_get_macro - all code was commented out

* Remove use of deprecated function action_get_macro - convert macro to use process_record_user

* Convert keymap to consistent use of _______

* fix use of old style header guards

* Swap KC_NO for XXXXXXX macro since the swap to the macro for KC_TRANS

* Resolve use of ?= in rules.mk files

* Remove duplication of rules.mk and config.h in gherkin mjt keymap

* Remove unnecessary #includes

* Align layout macros so foobar can use gherkin keymaps

* Align 6lit layout macros with foobar

* Remove ifndef QUANTUM_DIR from keymaps

keyboards/40percentclub/gherkin/keymaps/mjt/rules.mk

@@ -1,29 +1,2 @@
-## not sure where this stuff goes ##
-MCU = atmega32u4
-F_CPU = 16000000
-ARCH = AVR8
-F_USB = $(F_CPU)
-OPT_DEFS += -DBOOTLOADER_SIZE=4096
-
-# Build Options
-#   change to "no" to disable the options, or define them in the Makefile in
-#   the appropriate keymap folder that will get included automatically
-#
-BOOTMAGIC_ENABLE = no       # Virtual DIP switch configuration(+1000)
-MOUSEKEY_ENABLE = yes       # Mouse keys(+4700)
-EXTRAKEY_ENABLE = yes       # Audio control and System control(+450)
-CONSOLE_ENABLE = no         # Console for debug(+400)
-COMMAND_ENABLE = yes        # Commands for debug and configuration
-NKRO_ENABLE = yes           # Nkey Rollover - if this doesn't work, see here: https://github.com/tmk/tmk_keyboard/wiki/FAQ#nkro-doesnt-work
-BACKLIGHT_ENABLE = yes      # Enable keyboard backlight functionality
-MIDI_ENABLE = no            # MIDI controls
-AUDIO_ENABLE = yes           # Audio output on port C6
-UNICODE_ENABLE = no         # Unicode
-BLUETOOTH_ENABLE = no       # Enable Bluetooth with the Adafruit EZ-Key HID
-RGBLIGHT_ENABLE = no        # Enable WS2812 RGB underlight. 
-SLEEP_LED_ENABLE = no       # Breathing sleep LED during USB suspend
-TAP_DANCE_ENABLE=yes
-
-ifndef QUANTUM_DIR
-	include ../../../../Makefile
-endif
+AUDIO_ENABLE = yes          # Audio output on port C6
+TAP_DANCE_ENABLE = yes