Core API Coverage - Sound

This is a tracking issue for API coverage. Entries should be checked off when they're exposed and documented.

- Format information
- [x] Sound::getName
- [x] Sound::getFormat
- [x] Sound::getLength
- [x] Sound::getNumTags
- [ ] Sound::getTag
- Defaults when played
- [x] Sound::set3DConeSettings
- [x] Sound::get3DConeSettings
- [ ] Sound::set3DCustomRolloff
- [ ] Sound::get3DCustomRolloff
- [x] Sound::set3DMinMaxDistance
- [x] Sound::get3DMinMaxDistance
- [x] Sound::setDefaults
- [x] Sound::getDefaults
- [x] Sound::setMode
- [x] Sound::getMode
- [x] Sound::getLoopCount
- [x] Sound::getLoopCount
- [x] Sound::setLoopPoints
- [x] Sound::getLoopPoints
- Relationship management
- [x] Sound::setSoundGroup
- [x] Sound::getSoundGroup
- [x] Sound::getNumSubSounds
- [x] Sound::getSubSound
- [x] Sound::getSubSoundParent
- Data reading
- [x] Sound::getOpenState
- [x] Sound::readData
- [x] Sound::seekData
- [x] Sound::lock
- [x] Sound::unlock
- Music
- [x] Sound::getMusicNumChannels
- [x] Sound::setMusicChannelVolume
- [x] Sound::getMusicChannelVolume
- [x] Sound::setMusicSpeed
- [x] Sound::getMusicSpeed
- Synchronization / markers
- [x] Sound::getSyncPoint
- [x] Sound::getSyncPointInfo
- [x] Sound::getNumSyncPoints
- [x] Sound::addSyncPoint
- [x] Sound::deleteSyncPoint
- General
- [ ] Sound::setUserData
- [ ] Sound::getUserData
- [x] Sound::getSystemObject