Mark3 RTOS Source

Optimizing write ack delay loop to enable faster loads at higher speeds (115200+ now possible)

Bugfixes and optimizations to bootloader. Works on 1284p.

-Removing unnecessary startup code on CM3 target
-Adding support for stack offset register on CM0 + CM3

Adding support for kernel callouts to mark3c

Adding KERNEL_USE_STACK_GUARD, which causes kernel panics when the current thread's stack is below a given threshold, prior to switching threads.

missed a couple of macro defines for stack growth.

Adding optional thread callouts on context switch -- useful for implementing CPU utilization functionalities.

Adding kernel panic on no-schedulable-threads

documentation updates

Adding thread callout types to thread.h