obs-nvenc: SDK 13.0 Features

[derrod]

Description

Adds SDK 13.0 features:

• 10-bit H.264 encoding
• AV1 UHQ tune
• Temporal filtering for H.264 and AV1 (part of UHQ for AV1)
• 4-way split (on supported cards)
• Inband HDR metadata (mastering display/content light level)

Also improves capability detection to be a bit more reliable for UHQ support.

Note that 4:2:2 encoding is not supported by OBS and other SDK 13.0 features like MJPEG decoding will probably need to wait on FFmpeg updates.

Motivation and Context

Fun new stuff.

How Has This Been Tested?

Blackwell GPU.

Types of changes

• New feature (non-breaking change which adds functionality)

Checklist:

• My code has been run through clang-format.
• I have read the contributing document.
• My code is not on the master branch.
• The code has been tested.
• All commit messages are properly formatted and commits squashed where appropriate.
• I have included updates to all appropriate documentation.