Big-Wad-O-Changes:

* Use LiquidCrystal.h from Arduino
* Remove SDCard/lib_sd
* Remove avr/*
* Use Arduino.h instead of avr/* pin IO
* Remove unused Marlin firmware
* Move from a 'main.cpp' build to an 'sjfw.ino' build

Signed-off-by: Jason S. McMullan <jason.mcmullan@netronome.com>
libraries: Move libraries to a 'libraries' directory

Signed-off-by: Jason McMullan <jmcmullan@BrundleFab.suncrest.evillabs.net>
GCode.cpp: Remove 'USE_MARLIN' code sections.

Signed-off-by: Jason McMullan <jmcmullan@BrundleFab.suncrest.evillabs.net>
SD: Work on SD autorun support for the Arduino SD library

Signed-off-by: Jason McMullan <jmcmullan@BrundleFab.suncrest.evillabs.net>
Host: Fix the Serial support, default to 115200 baud

Signed-off-by: Jason McMullan <jmcmullan@BrundleFab.suncrest.evillabs.net>
.gitignore: Ignore Arduino.mk build directory

Signed-off-by: Jason S. McMullan <jason.mcmullan@gmail.com>