- used constness wherever possible
- cleaner constructor with proper initialized variables
- replaced defines (preprocessor) by const type to get better
compiler-errors
- inlined the display-functions --> typically found in the header
- made the class uncopyable to get no strange undefined behavior if
someone tries it
- controllerDirection and Mode have been int-type, but char will suffice
when github was adding a hash to the library download zip, there was confusion from beginners about needing to rename the unzipped folder before moving into the arduino ide.
this library has been prepped (thijse) for the arduino library manager, which requires the library to be in the root directory. Having the library in the manager also removes the "beginner user hash" concern.
