Mark3 RTOS Source

-Ensure that the official test suite is only built for AVR, and not for other architectures where support for kernel-aware debugging, and built-in drivers may not exist.

Improvements to preliminary cortex m3/4/7 port.

- Removed superfluous code that was brought in out of desparation yesterday
- Cleaning up stuff, now that I know the fundamental code works
- Fixing linker args correctly so that "undefined reference to 'x'" doesn't occur

Adding rough kernel setup example for cortex m3

Adding very-rough prototype cortex M3/4/7 support to the kernel

Adding support for assembly-language objects.

Adding preliminary circular-buffer based stream class

Fixing scheduler to use correct defines from mark3cfg.h instead of scheduler.h for determining number of thread priorities.

Fixing priority mapping for 2-level bitmap case.

Updating copyrights to 2016

Updating reference to priority map in the docs.
Correcting the logic used to generate priomaps, such that the correct types are used for the right range of priorites.