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/talljoe-gherkin/config.h

@@ -1,6 +1,3 @@
-#ifndef CONFIG_USER_H
-#define CONFIG_USER_H
+#pragma once
 
-#include "../../config.h"
-
-#endif
+// place overrides here

keyboards/40percentclub/gherkin/keymaps/talljoe-gherkin/keymap.c

@@ -4,8 +4,6 @@
 #define ST_BOLT QK_STENO_BOLT
 #define ST_GEM  QK_STENO_GEMINI
 
-#define XXXXXXX KC_NO
-
 enum keyboard_layers {
   _QWERTY,
   _RAISE,

keyboards/40percentclub/gherkin/keymaps/talljoe-gherkin/rules.mk

@@ -1,6 +1,2 @@
-ifndef QUANTUM_DIR
-  include ../../../../Makefile
-endif
-
 MOUSEKEY_ENABLE = no        # Mouse keys(+4700)
 STENO_ENABLE = yes          # Additional protocols for Stenography(+1700), requires VIRTSER