1.2.0

Added

• Arduino CircleCI config

Changed

• updated keywords.txt.
• updated ./library.json package export settings.
• removed unnecessary files:
  • ./appveyor.yml.
  • ./CMakeSettings.json.
  • submodule from cmake_example.
• removed ./src/stl library.
• moved ./docs to ./extras in arduino builds.
• automated ARDUINO_IDE.sh script.
• updated ARDUINO_IDE.sh script to reflect lib/ changes.