[Keyboard] Added support for ErgoDox with STM32 Microcontroller (#5398)

* Began Work On STM32 Ergodox
 Changes to be committed:
	new file:   keyboards/ergodox_stm32/config.h
	new file:   keyboards/ergodox_stm32/rules.mk

* test

* Now it compile. Not linking thou

* Screw this Linker. It links now!

* Blinkly Keyboard

* bootloader test code

* Working on matrix / i2c stuff

* Progress (LED Blink)

* Progress on MCP_23017 Status Flag

* [WIP]

* update

* Works! Remeber to change back the bootloader address when the new bootloadrer is ready.

* Time to go debug the i2c

* Finally, it now works with PCB Rev 1.0.2

* updated for rev.2 pcb

* minor compilation fix

* Why when debugger is enabled then everything works.

* Remeber to call init functions.

* Update arm i2c driver to support STM32F103 series device.

* fix include once header. Replaced with #pragma once.

* complication test

keyboards/ergodox_stm32/rules.mk

@@ -0,0 +1,32 @@
+SRC += matrix.c
+QUANTUM_LIB_SRC += i2c_master.c
+
+CFLAGS += "-Wno-error=deprecated"
+
+MCU_FAMILY = STM32
+MCU_SERIES = STM32F1xx
+
+MCU_LDSCRIPT = stm32f103_bootloader
+
+MCU_STARTUP = stm32f1xx
+
+BOARD = ERGODOX_STM32_BOARD
+
+MCU = cortex-m3
+
+ARMV = 7
+
+OPT_DEFS =
+
+EXTRAFLAGS=-O0 -g
+
+BOOTMAGIC_ENABLE = no
+MOUSEKEY_ENABLE = no	# Mouse keys
+EXTRAKEY_ENABLE = yes	# Audio control and System control
+CONSOLE_ENABLE = no	# Console for debug
+COMMAND_ENABLE = no    # Commands for debug and configuration
+SLEEP_LED_ENABLE = no  # Breathing sleep LED during USB suspend
+NKRO_ENABLE = yes	    # USB Nkey Rollover
+CUSTOM_MATRIX = yes # Custom matrix file
+NKRO_ENABLE      = yes # USB Nkey Rollover - if this doesn't work, see here: https://github.com/tmk/tmk_keyboard/wiki/FAQ#nkro-doesnt-work
+UNICODE_ENABLE   = yes # Unicode