NxWidgets::CScaledImage: New class that wraps any class that provides IBitMap and adds image scaling

NxWM::CCalibration: Add logic to collect and average samples, optionally discarding the most extreem values

Misc changes to README files; Update SAMA5D3x-EK NxWM configuration to use Calibration instruction messages

SAMA5 LCDC:  Correct how framebuffer memory was being mapped; Remove options to get framebuffer memory in various.  Because of the mapping and aligment requirements, those options really cannot be supported

Changed the meaning of the uip_*input functions. They now return success when a packet is dropped; This is needed for the ENCX24J600 driver that must make a decision to return the packet or not:  It should not retain dropped packets. From Max Holtzberg

Notify the socket layer if a connection is lost before the monitoring callback has been registered.  From Max Holtzberg

SAMA5 LCDC:  Wait when the LCDC is resynchronizing (SIF); Try start-up parameters from Barebox (this still don't work)

SAMA5 LCDC: Default resolution if now RGB565; Add option to select a different output resolution than the sofware resolution (needs to the 24BPP for this LCD).

SAMA5 LCDC: Move DMA descriptors out of internal SRAM and into SDRAM. I am not completely clear, but it looks like the LCDC cannot support DMA from internal SRAM

Add option to enable Aduino Due specific logic, like pull-up on UART0 RXD.  Suggested by gdi@embedders.org