Mark3 RTOS Source

A few improvements and fixes
-Adding out-of-scope kernel panics; can't have kernel objects allocated on stack disappearing at runtime while in use! (more to come)
-Fix a bug in timers where double-starting a timer can mess up the global timer list
-Adding a timer start() method to restart an expired one-shot timer
-Fix a bug where removing a timer from the context of a one-shot timer callback could break timer expiry callbacks for other expired timers.

Attempt to get mono-derived FunkProgMono.exe building for cross-platform use.

Updated FunkProgMono for faster loads (115200+)

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.