* [stm32f401-nucleo] arduino support
* 增加application arduino main文件
* 调整目录结构

[stm32f072] support Arduino I2C and update readme

- add comments
- remove ARDUINO_PWM_HZ
- remove initVariant blank function
- support DAC0
- improve Kconfig of STM32L475 PANDORA
- add readme
- add i2c1 bus device

* [stm32 pandora] fix the bug when using LCD demo

* arduino 增加内部温度传感器和参考电压通道

* remove ARDUINO_PINOUT_PWM_MAX

* [stm32][nucleo-f072] add arduino gpio support

* 完善stm32f401nucleo的基本配置

* 修改led引脚描述

* 潘多拉增加arduino引脚别名

* [ARDUINO]STM32L072RB 增加ADC A0-A5的引脚配置

* add pwm

* [Arduino][stm32l475] enable i2c bus device

* 增加默认i2c总线设备名称

* [arduino] 初步实现Arduino生态兼容组件

* [stm32f475] 增加PC2 作为ADC1_IN3

* [stm32l475][port] 将路径Arduino改为arduino

[stm32][bsp] The sconscript script in the application folder increases the recursion searching capability

Signed-off-by: NWillian Chan <chentingwei@rt-thread.com>

Signed-off-by: NWillian Chan <chentingwei@rt-thread.com>