Port of the FreeRTOS Kernel for Arduino.

Tested Boards

Name	Notes
Arduino Uno	Rev3 and Rev3 SMD
Arduino Mega 2560
Arduino Leonardo
Arduino Pro Mini	ATmega328P, 5V, 16MHz
Arduino UNO R4	MINIMA and WiFi
Arduino Uno Wifi	Rev2
Arduino Nano Every

Source changes

• Some includes had to be adjusted for the renesas port (see comments in FSP folder starting with "// CHANGE ...").
• The name of TCB_t has been changed to FreeRTOS_TCB_t (in the files croutine.h and task.c) because the Arduino megaavr architecture core implementation uses the same type name in the sources.
• The file timers.h has been renamed to timersFreeRTOS.h because the Arduino megaavr architecture core implementation includes a file with the same name.
• The include order of FreeRTOS.h and porthardware.h in port.c (megaavr port in folder AVR_Mega0) had to be swapped.