CRM-14370 - API Kernel - Dispatch events
CRM-14370 - API Kernel - Extract TransactionSubscriber
CRM-14370 - API Kernel - Extract XDebugSubscriber
CRM-14370 - API Kernel - DRY exception-handling; fix inconsistencies
CRM-14370 - API Kernel - DRY result formatting
CRM-14370 - API Kernel - Extract I18nSubscriber
CRM-14370 - API Kernel - Move authorization to listener
CRM-14370 - API Kernel - Extract APIv3SchemaAdapter
CRM-14370 - API Kernel - Extract WrapperAdapter
CRM-14370 - API Kernel - Fix short-circuiting which breaks formatters/exceptions-handlers