implemented a mixture of Sonny's MATLAB and my previous grbl planner

ontop of the edge planner
examples run byte for byte identical old and new version

sim/avr/interrupt.c

@@ -40,3 +40,4 @@ uint16_t pcmsk0;
 uint16_t pcicr;
 
 void sei() {};
+void cli() {};

sim/avr/interrupt.h

@@ -49,6 +49,7 @@ extern uint16_t pcicr;
 
 // enable interrupts does nothing in the simulation environment
 void sei();
+void cli();
 
 // dummy macros for interrupt related registers
 #define TIMSK0 timsk0