Trailing spaces, guid names consistency with MMS module, calloc, enum

Pointed-out-by: Michael A. Puls II

also simplify arm neon preprocessor checks

1tbs
remove hungarian prefixes

Audio buffers are destroyed downstream of the decoder, so this
function could never be used. In practice, the audio filters, the
audio output (or the encoder) already use block_Release() to delete
buffers allocated with decoder_NewAudioBuffer().

If "direct rendering" is ever implemented in audio output,
block_Release() custom buffer deletion can be used.

Close #4926

This is the last version that doesn't require p11-kit

Used for track title by iTunes/QT

Close #4922 #3983

I am not sure this is the right way to do yet, but this will act as a
work-around, until we have a proper fix

Close #5141

Close #3887

Close #2434

Maybe this shouldn't be in the interface, but in the playlist...