Revise how delays are calculated in SPI bit bang driver so that we may get a little better frequency resolution

Add a general bit-bang SPI lower-half driver and implement the bit-bang driver for the Arduino ITEAD TFT shield

Add an NSH configuration for the Arduino Due; Pluse several fixes related to the Due and to the SAM3X in general

Arduino Due: Fixes to FLASH address, flash wait states, updated Comments.  Now boots and runs a bit before crashing

Flesh out the Arduino Due board configuratino and integrate it with the build and configuration system

Add peripheral configuration logic for the SAM3X/3A; Change all references to SAM3/4 SPI to SPI0 for compatibity with the SAM3X/3A which has SPI0 and SPI1; Add directory which will eventually holdl an Arduino Due port

Add support for a separate CCM memory allocator for members of the STM32 family that support CCM memory

Fix UG-2832HSWEG04 landscape.  Add reverse landscape support to UG_2864AMBAG01 and UG-9964HSWAG01.  Fixe NXHELLO default colors for 1-bit mono modes

Add support for the UG-2843HHSWEG04 OLED and for the SAM4L Xplained Pro OLED module that uses that OLED.