Agora RTC Objective-C API Reference Refactor

Data Structures
agora::internal Namespace Reference

## Data Structures
struct | CopyAssignable
struct | CopyAssignable< false >
struct | CopyConstructible
struct | CopyConstructible< false >
struct | MoveAssignable
struct | MoveAssignable< false >
struct | MoveConstructible
struct | MoveConstructible< false >
class | OptionalBase
struct | OptionalStorage
struct | OptionalStorageBase