This seals up a major memory leak of the playback state whenever a chain
is released on stop or on manual track change. CogAudioMulti was
retaining the input node due to its listeners, and InputNode was not
releasing the listeners when asked to stop running. This is fixed now.
Fixes#221
Signed-off-by: Christopher Snowhill <kode54@gmail.com>
- Avoid creating an NSDictionary with NULL context object (https://github.com/kode54/Cog/blob/master/Audio/Chain/InputNode.m#L81 passes NULL as context, so this must be handled in NSDictionary creation
- When calling addObserver, downgrade options from NSNumber * to NSKeyValueObservingOptions (aka NSUInteger)
Not sure why this would be specific to Apple Silicon...
