mixer: move members to initializer part of constructor
mixer: rename NumFxChannels to NUM_FX_CHANNELS to hint global variable.
mixer: add stubs of MixerBuilder
mixer: move fabrication logic to MixerBuilder

This fills in the build, buildFrames, buildFxChannels, buildFifo stubs in
the MixerBuilder, with the previous statements in the Mixer constructor.
mixer: move aligned/mal/free stuff to MemoryHelper
memoryhelper: missing ;
memoryhelper: add stdlib.h
mixer: move rest of fabrication logic to builder
mixer: make engine use the builder now
Song: cleanup and coding style improvements
Song: revert accidental change
OpulenZ: changed some __inline functions to "static inline",
	which is more in line with later C dialects
Merge pull request #549 from softrabbit/stable-1.0

OpulenZ: code improvements (C99 compatibility)
Added Apple specific artwork
Added Apple specific packaging/installation scripts
Added Apple specific compile options
Omit OpulenZ plugin directory on Apple
Added isnan(), etc declarations for Apple
Clang comp. fix, out.real()+= syntax error
Fix #include <QtXml> on Apple/MacPorts