remove AVR folder

this branch will be for STM8L MCU only
remove STM8S peripheral device driver
add STM8L standard peripheral drivers V1.6.0
remove STM8S related files

remove files: IAR project files, STM8 int vectors, STM8S conf file and
old main.c
fix IAR comile error

change section .text to .near_func.text
add .gitignore file

filter useless files