Merge pull request #85 from zfields/develop

Resolved several /W4 warnings
Fixes to support compatibility
Split Ethernet library into it's own NuGet package.
- bring avr directory reference into NuGet
- add avr/macros.h and avr/interrupt.h files
- add necessary `#include <cstring>` into avr/pgmspace.h
Remove analog `#defines` from Arduino.h in favor of pins_arduino.h
Remove Print.h
Update dependency name
Update readme for SDKFromArduino dependency
Reduce documentation by combining Pro/Express
Fix source highlight
Merge pull request #88 from ooeygui/compat

Improve Arduino compatibiltiy
Added API Test Project for testing/calling global functions
- provided valid NuGet package ids for eepromTest and analogWriteResolutionTest