This is npw a function pointer so that a simple stdout printout can be used as default, but allows to override it.
Also added the missing timidity_file.h header.
- a bit of header cleanup.
* moved <zlib.h> and <bzlib.h> from files.h to files_decompress.cpp because they are no longer needed for defining the interface.
* added <functional> to the precompiled header
This reverts commit 8f7a503561.
# Conflicts:
# src/sound/timiditypp/playmidi.cpp
Something in here wasn't working as intended, and since it needs better synchronization let's redo it entirely.
This may cause problems because the player runs in a different thread than the input code.
Instead the play thread will now copy their values to local variables when it starts generating output.
