Export PresetPreviewPlayHandle class

The PresetPreviewPlayHandle is referenced by the PeakController plugin
now and therefore needs to be exported.
ZynAddSubFX: fixed compiler warning on Win32
MidiWinMM: fixed MidiPort API calls
Papu: fixed out-of-bounds array access due to too small data types

Build failed on Win32 with GCC 4.8.
Added initial versions of new logo