This merely addresses the crashing issue, it does nothing about the faulty initialization logic here that causes the chorus not to get initialized properly if reverb is active.
The issue needs more in-detail investigation but for now this has to suffice.
- 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
