Documenting the differences between SDK Release 8.5.0 and 8.5.3

• Add methods to detemine how long a stream has been open for.
• Add method to determine if audio only mode is active on BW encoders.

SDK 8.5.3 API diff

New methods on Stream class to provide access to the time that the stream has been in use for.

int64_t Stream::GetStreamUseDuration() const; int64_t Stream::GetLastStreamUseDuration() const;

New method on EncoderConfig class to determine if audio only mode is enabled on BW encoders.

bool EncoderConfig::GetAudioOnlyEnabled() const;