Arduino Support

[pschatzmann]

Thanks for your quick answer.

I did not want to impact/change any existing functionality, so here is my proposed solution:

• I added the src directory for Arduino and added the two relevant implementation files which point to your implementation in foxen directory. I would have liked to do this with the help of symlinks, but then we would have most of the Windows users complaining. Initially I used flac.h and flac.c, bat this was giving conflics with the standard FLAC library. So I settled for foxen-flac.h and foxen-flac.c
• I added libraries.properties that is required by Arduino
• Finally I needed to add some #ifdef ARDUINO in flac.c to point to the correct header file

Finally, I added the support of this library to my AudioTools library tested with an ESP32 with this Arduino Sketch. Unfortunatly the WIFI seems to be too slow for regular FLAC files, but loading the data from a SD should be just fine.