Visual Micro 1810.3 for Visual Studio 2012-2017

• Fix: Unable to compile "Shared library projects" that use "the old style" arduino library structure (without library.properties). These projects were incorrectly compiled as a merge project instead of as a library project. This fix assumes a library 1) if a library.properties file exists or 2) if the folder structure contains a folder named "\libraries".
  
• Libraries for specific architecture are now the lowest priority to reflect the way the Arduino IDE works. This means that if a library exists in sketchbook\libraries it will be used, otherwise if it exists in ide\libraries that will be used otherwise the  platform\libraries folder is used.
  
• Fix: Arduino versions less then 1.5.7 failed to compile in debug mode when "Deep search for libraries" was enabled
  
• Usb debug support for Adafruit M0 boards that have native_usb set to true yet use Serial instead of SerialUSB as default port.