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2011-03-22AUDIO: Add pure virtual MidiDriver::isOpen() methodMax Horn
This in turn enables modifying MidiDriver_MPU401::close() to allow it to be called on a midi driver that has not yet been opened. The specific issue that triggered me to make these changes was a crash-upon-quit in HUGO, caused by it instantiating a midi driver, then encountering an error (missing hugo.dat) *before* having opened the new midi driver; the general cleanup code then tries to close the (not yet opened) midi driver -> kaboom Also fixed some engines which were leaking MidiDriver instances.
2011-02-09AUDIO: Rename sound/ dir to audio/Max Horn
svn-id: r55850