This fixes all warnings for "make examples" for:
-Wunused-parameter
-Wshadow
-Wformat-security
-Wenum-conversion
Some remaining warnings include:
-Wdeprecated-delcarations
First step to get the examples compiling output in a useful state.
With all the warning noise one would never see the important messages.
If you add new code please make sure its warning free.
Jean-Philippe Andre
Stefan Schmidt
Ricardo de Almeida Gonzaga
Vincent Torri