1. add tim1/2/3/4/5/8 pwm driver and test pass by self.

[fix][libcpu][riscv][t-head] fix rt_hw_interrupt_disable/rt_hw_interupt_enable bug

[BSP] 添加 RA6M4-CPK 的 BSP 支持包

update readme | 重新整理首页readme英文版本，为增加葡萄牙语翻译做准备

使用不同的优化等级会出现不同的效果
当使用-O0 等级时，无法正确得到关闭中断之前的状态

Using different optimization levels will have different effects
When the - o0 level is used, the state before the shutdown interrupt cannot be obtained correctly

[update][bsp][at32][driver]Optimized the pin-index algorithm

[bsp][simulator] update project

# Conflicts:
#	bsp/ra6m4-cpk/README.md
#	bsp/ra6m4-cpk/docs/picture/rascuart.png
#	bsp/ra6m4-cpk/docs/使用瑞萨FSP配置工具.md
#	bsp/ra6m4-cpk/src/hal_entry.c

[update] 更新说明文档，修改文档中的错误描述

[bsp/stm32/libraries/HAL_Drivers/drv_wdt.c]: add SOC_SERIES_STM32G0 to fix wdt always reset.

[bsp][stm32][bluepill] update readme

[AT32] 完善ADC驱动

[bsp/stm32/libraries/HAL_Drivers/drv_wdt.c]: add SOC_SERIES_STM32G0 to use "stm32_wdt.hiwdg.Init.Window = 0x00000FFF", otherwise the watchdog always reset.

[fix] 修复scons脚本中错误的依赖宏

[bsp] remove empty rt_hw_us_delay

[libc][posix] move libc.c/.h to posix folder

[dfs] 保留dfs_poll.h dfs_select.h，加warning提示

[bsp/stm32/stm32g070-st-nucleo/board/Kconfig]: corret path.

[stm32l475][lvgl]update lv_demo.c

[add] 添加 SPI、flash、ADC、DAC 说明文档

[libc] 消除代码中将RT_LIBC_USING_FILEIO的预编译判断条件

增加对Draco板子LCD配置支持

update fatfs to the latest version

[libc][posix] 解决RT_LIBC_USING_FILEIO范围过大的问题