Cleaned code and added resampler to tutorial07.c. After that it work wor...

I cleaned up a code of tutorial07.c (As it code wans't intended as it should) then I fixed tutorial07.c to play s16p (or fltp) with libavresampler/libswresampler. You can also compile without. I had these all in separated commits but I'm so lousy at git.. this should do..