ClassKit macOS 11.1 to 11.3 API Differences

CLSActivity.h

Added -[CLSActivity removeAllActivityItems]

CLSContext.h

Added CLSContext.navigationChildContexts

Added -[CLSContext addNavigationChildContext:]

Added -[CLSContext removeNavigationChildContext:]

CLSDataStore.h

Added -[CLSDataStore fetchActivityForURL:completion:]