Avoid .ino

[flx5]

We should try to avoid .ino files (apart from short test cases) as those are not standard C++ compliant.

[barafael]

Sort of fixed with commit dcf9469.

.ino still needed, though. But no setup() or loop()! And standard C++ everywhere.

.ino must still have same name as directory, and cpp file containing the code must have a different name, also must not be main.cpp. Arduino libraries included anywhere must appear in .ino file too.