add 'include keyboard_features.mk' into build_keyboard.mk (#8422)
* add 'include keyboard_features.mk' into build_keyboard.mk keyboard_features.mk is a keyboard-local version of the functions performed by common_features.mk. * add comment into build_keyboard.mk * added description of keyboard_features.mk in hardware_keyboard_guidelines.md. * rename `keyboard_features.mk` to `post_rules.mk`
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		@@ -115,6 +115,7 @@ include $(INFO_RULES_MK)
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# Check for keymap.json first, so we can regenerate keymap.c
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include build_json.mk
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# Pull in keymap level rules.mk
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ifeq ("$(wildcard $(KEYMAP_PATH))", "")
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    # Look through the possible keymap folders until we find a matching keymap.c
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    ifneq ("$(wildcard $(MAIN_KEYMAP_PATH_5)/keymap.c)","")
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@@ -345,6 +346,7 @@ ifeq ("$(USER_NAME)","")
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endif
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USER_PATH := users/$(USER_NAME)
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# Pull in user level rules.mk
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-include $(USER_PATH)/rules.mk
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ifneq ("$(wildcard $(USER_PATH)/config.h)","")
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    CONFIG_H += $(USER_PATH)/config.h
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@@ -356,6 +358,23 @@ endif
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# Disable features that a keyboard doesn't support
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-include disable_features.mk
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# Pull in post_rules.mk files from all our subfolders
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ifneq ("$(wildcard $(KEYBOARD_PATH_1)/post_rules.mk)","")
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    include $(KEYBOARD_PATH_1)/post_rules.mk
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endif
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ifneq ("$(wildcard $(KEYBOARD_PATH_2)/post_rules.mk)","")
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    include $(KEYBOARD_PATH_2)/post_rules.mk
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endif
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ifneq ("$(wildcard $(KEYBOARD_PATH_3)/post_rules.mk)","")
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    include $(KEYBOARD_PATH_3)/post_rules.mk
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endif
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ifneq ("$(wildcard $(KEYBOARD_PATH_4)/post_rules.mk)","")
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    include $(KEYBOARD_PATH_4)/post_rules.mk
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endif
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ifneq ("$(wildcard $(KEYBOARD_PATH_5)/post_rules.mk)","")
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    include $(KEYBOARD_PATH_5)/post_rules.mk
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endif
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ifneq ("$(wildcard $(KEYMAP_PATH)/config.h)","")
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    CONFIG_H += $(KEYMAP_PATH)/config.h
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endif
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@@ -144,10 +144,38 @@ The `rules.mk` file can also be placed in a sub-folder, and its reading order is
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        * `keyboards/top_folder/sub_1/sub_2/sub_3/sub_4/rules.mk`
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          * `keyboards/top_folder/keymaps/a_keymap/rules.mk`
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          * `users/a_user_folder/rules.mk`
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        * `keyboards/top_folder/sub_1/sub_2/sub_3/sub_4/post_rules.mk`
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      * `keyboards/top_folder/sub_1/sub_2/sub_3/post_rules.mk`
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    * `keyboards/top_folder/sub_1/sub_2/post_rules.mk`
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  * `keyboards/top_folder/sub_1/post_rules.mk`
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* `keyboards/top_folder/post_rules.mk`
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* `common_features.mk`
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Many of the settings written in the `rules.mk` file are interpreted by `common_features.mk`, which sets the necessary source files and compiler options.
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The `post_rules.mk` file can interpret `features` of a keyboard-level before `common_features.mk`.  For example, when your designed keyboard has the option to implement backlighting or underglow using rgblight.c, writing the following in the `post_rules.mk` makes it easier for the user to configure the `rules.mk`.
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* `keyboards/top_folder/keymaps/a_keymap/rules.mk`
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  ```makefile
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  # Please set the following according to the selection of the hardware implementation option.
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  RGBLED_OPTION_TYPE = backlight   ## none, backlight or underglow
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  ```
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* `keyboards/top_folder/post_rules.mk`
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  ```makefile
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  ifeq ($(filter $(strip $(RGBLED_OPTION_TYPE))x, nonex backlightx underglowx x),)
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     $(error unknown RGBLED_OPTION_TYPE value "$(RGBLED_OPTION_TYPE)")
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  endif
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  ifeq ($(strip $(RGBLED_OPTION_TYPE)),backlight)
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    RGBLIGHT_ENABLE = yes
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    OPT_DEFS += -DRGBLED_NUM=30
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  endif
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  ifeq ($(strip $(RGBLED_OPTION_TYPE)),underglow)
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    RGBLIGHT_ENABLE = yes
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    OPT_DEFS += -DRGBLED_NUM=6
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  endif
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  ```
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?> See `build_keyboard.mk` and `common_features.mk` for more details.
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### `<keyboard_name.c>`
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