Replacement for AVR libc ATOMIC_BLOCK macros, now for DUE and other platforms.

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pYro_65:
And it does not use any gcc specific attributes making it far more portable.

From avr-libc for the ATOMIC_BLOCK macros.

Note:
The macros in this header file require the ISO/IEC 9899:1999 ("ISO C99") feature of for loop variables that are declared inside the for loop itself. For that reason, this header file can only be used if the standard level of the compiler (option --std=) is set to either c99 or gnu99.

Along with this whole thing which is certainly not standard:

#define ATOMIC_RESTORESTATE uint8_t sreg_save \
	__attribute__((__cleanup__(__iRestore))) = SREG