Mark3 RTOS Source

Adding missing scheduler ehader changes

Implemented Semaphore/Mutex/Event-flags based on the new kernel transaction queue. The kernel code is now fully deterministic in that all critical sections are fixed-time in duration (Complexity of O(1) - previously implementation contained O(n) Critical sections). There's a tradeoff - the code is slightly more complex and a bit slower, but we spend far less time with interrupts disabled in total. Determinism wins out here.

Resizing stacks for tests. Weird failure on ut_semaphore that needs some investigation...

Adding atomic.cpp and transaction.cpp to the kernel makefile

Adding Kernel Transaction Queues, which will be used for implementing deterministic blocking objects (blocking objects without large blocks of interrupt-disabled code).

One more fix to the export script for arduino (was missing keywords.txt)

Updates to the export script for samd20.

Adding missing include...

Adding preliminary samd20 system library

Updated Readme.odt based on new target support, website info, etc.