This isn't the final location but this means that the device is merely a data provider, with the sole exception of the Win32 MIDI device whose unwieldy usage requirements unfortunately dictate much of the needed interface here.
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.
