Use NSInteger everywhere else (identified with -DNS_BUILD_32_LIKE_64).
Remove NJRSoundManager and device volume setting code.

May be useful again one day if OS X's audio system becomes like a more customizable iOS audio system, but not right now.

Moves -volumeIsNotMutedOrInvalid: into NJRSoundDevice.
Clean up NJRQTMediaPopUpButton.

Use AudioServicesPlayAlertSound for consistency with the alert.

Rename some instance variables and methods to reflect that the media may not be a movie, and we're not checking if it is audio, we're checking whether its volume can be adjusted.
NDEBUG, N.
Pester to do.oo3: Updated status.
Remove extraneous Core Data reference.