Do not copy Arduino's source code into arduino-ats/_arduino.

[master-q]

Please use arduino-core package's.
https://packages.debian.org/sid/arduino-core

[master-q]

The arduino-core includes C++ API and C API. ATS language can't use any C++ API.
Then, this project should do following:

1. Copy C/C++ language code include headers from arduino-core
2. Remove C++ part in the code