There's really no need for a non-standard solution here anymore with C++11.
This also fixes an unreleased lock in the WildMidi code.
# Conflicts:
# src/posix/sdl/critsec.cpp
This was done after the players had already been created. To ensure that everything gets set properly it is necessary to pass the desired sample rate to the device's constructor and let it make sure that a proper sample rate gets set.
- enable precompiled headers for all non-system-specific MIDI devices.
- moved the native Windows and Mac MIDI devices into their respective sections in the project file so that they won't get compiled on the other ones.
