Mark3 RTOS Source

Fixed the HW SPI interface for the ST7735 driver.

Updated st7753 example with a ball-and-paddle game example.

Added ST7735 driver and demo (SW-SPI only. HW-SPI in progress).

Added zero-limited unblock.

Adding Configurator Binary to embedded root.

Adding Source for Mark3 Kernel Configuartor utility

-Fixed up sanity test (works with mega644 and larger)
-Setting optimizations by default on 644s
-Updating build.mak to manage CPU-specific headers

Updated size_profile.sh to support multiple targets

Adding preliminary (And untested) ST7735 driver based on Adafruit implementation (heavily modified, with attributions in place)

Optimization and documentation updates:
- Removing dependency of BlockingObjects on Atomic functionality
- Making Atomic functionality a build option
- Moving a number of module-based defines into the global config file
- Updated docs for a few modules
- Fixed a couple of invalid mark3cfg.h combinations
- Adding a size-based profiling tool
- Adding size-based profiling output to the doxygen docs
- Rebuilt doxygen docs