Keyboard: Add new keyboard Zinc (#4245)

* Add Zinc keyboard

* Fix photo

* Fix readme.md

* Fix RGB LED init of monks/keymap.c

* Fix default keymap and readme.jp

* Fix change DEFS of RGB ANIMATIONS to LED_ANIMATIONS

* Add EOL

* Use serial_config_simpleapi.h

* Fix comment char

* Fix error handling in split_scomm.c : mtei works

* Fix keymaps

* Remove DISABLE_LEADER definition

* Remove pro_micro.h

* Add 2 spaces after Hardware name

* Fix keymaps
  - remove audio codes
  - change LAYOUT to LAYOUT_ortho_4X12
  - change "persistent_default_layer_set" to core function

* Use the Community Layouts feature
  -  with some clean up

keyboards/zinc/keymaps/default/rules.mk

@@ -0,0 +1,98 @@
+
+# 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 = no       # Mouse keys(+4700)
+EXTRAKEY_ENABLE = yes       # Audio control and System control(+450)
+CONSOLE_ENABLE = no         # Console for debug(+400)
+COMMAND_ENABLE = no        # Commands for debug and configuration
+NKRO_ENABLE = no            # Nkey Rollover - if this doesn't work, see here: https://github.com/tmk/tmk_keyboard/wiki/FAQ#nkro-doesnt-work
+BACKLIGHT_ENABLE = no      # Enable keyboard backlight functionality
+MIDI_ENABLE = no            # MIDI controls
+AUDIO_ENABLE = no           # 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.  Do not enable this with audio at the same time.
+SWAP_HANDS_ENABLE = no        # Enable one-hand typing
+
+define ZINC_CUSTOMISE_MSG
+  $(info Zinc customize)
+  $(info -  LED_BACK_ENABLE=$(LED_BACK_ENABLE))
+  $(info -  LED_UNDERGLOW_ENABLE=$(LED_UNDERGLOW_ENABLE))
+  $(info -  LED_ANIMATION=$(LED_ANIMATIONS))
+  $(info -  IOS_DEVICE_ENABLE=$(IOS_DEVICE_ENABLE))
+endef
+
+# Zinc keyboard customize
+LED_BACK_ENABLE = no        # LED backlight (Enable SK6812mini backlight)
+LED_UNDERGLOW_ENABLE = no   # LED underglow (Enable WS2812 RGB underlight)
+LED_ANIMATIONS = yes        # LED animations
+IOS_DEVICE_ENABLE = no      # connect to IOS device (iPad,iPhone)
+Link_Time_Optimization = no # if firmware size over limit, try this option
+
+####  LED_BACK_ENABLE and LED_UNDERGLOW_ENABLE.
+####    Do not enable these with audio at the same time.
+
+### Zinc keyboard 'default' keymap: convenient command line option
+##    make ZINC=<options> zinc:defualt
+##    option= back | under | na | ios
+##    ex.
+##      make ZINC=under    zinc:defualt
+##      make ZINC=under,ios zinc:defualt
+##      make ZINC=back     zinc:default
+##      make ZINC=back,na  zinc:default
+##      make ZINC=back,ios zinc:default
+
+ifneq ($(strip $(ZINC)),)
+  ifeq ($(findstring back,$(ZINC)), back)
+    LED_BACK_ENABLE = yes
+  else ifeq ($(findstring under,$(ZINC)), under)
+    LED_UNDERGLOW_ENABLE = yes
+  endif
+  ifeq ($(findstring na,$(ZINC)), na)
+    LED_ANIMATIONS = no
+  endif
+  ifeq ($(findstring ios,$(ZINC)), ios)
+    IOS_DEVICE_ENABLE = yes
+  endif
+  $(eval $(call ZINC_CUSTOMISE_MSG))
+  $(info )
+endif
+
+ifeq ($(strip $(LED_BACK_ENABLE)), yes)
+  RGBLIGHT_ENABLE = yes
+  OPT_DEFS += -DRGBLED_BACK
+  ifeq ($(strip $(LED_UNDERGLOW_ENABLE)), yes)
+    $(eval $(call ZINC_CUSTOMISE_MSG))
+    $(error LED_BACK_ENABLE and LED_UNDERGLOW_ENABLE both 'yes')
+  endif
+else ifeq ($(strip $(LED_UNDERGLOW_ENABLE)), yes)
+  RGBLIGHT_ENABLE = yes
+else
+  RGBLIGHT_ENABLE = no
+endif
+
+ifeq ($(strip $(IOS_DEVICE_ENABLE)), yes)
+    OPT_DEFS += -DIOS_DEVICE_ENABLE
+endif
+
+ifeq ($(strip $(LED_ANIMATIONS)), yes)
+#    OPT_DEFS += -DRGBLIGHT_ANIMATIONS
+     OPT_DEFS += -DLED_ANIMATIONS
+
+endif
+
+ifeq ($(strip $(Link_Time_Optimization)),yes)
+    EXTRAFLAGS += -flto -DUSE_Link_Time_Optimization
+endif
+
+# Do not enable SLEEP_LED_ENABLE. it uses the same timer as BACKLIGHT_ENABLE
+SLEEP_LED_ENABLE = no    # Breathing sleep LED during USB suspend
+
+
+# Uncomment these for debugging
+# $(info -- RGBLIGHT_ENABLE=$(RGBLIGHT_ENABLE))
+# $(info -- OPT_DEFS=$(OPT_DEFS))
+# $(info )