New Feature: Face landmark detection

[norihiro]

• Add face landmark detection.
• Put textures on the face optionally. And not render the original texture optionally.
• If this is accurate and fast, it can replace correlation-tracker and will detect lost face earlier.
  • No, face landmark detection requires the bounding box accurately.

[UnrelatedWorks]

Add a sentence in the documentation which links to articles that explain how users may create their own dataset.

[norihiro]

Add a sentence in the documentation which links to articles that explain how users may create their own dataset.

There is a link to dlib-models in these documents. They explain how to create the dataset.

• https://github.com/norihiro/obs-face-tracker/blob/main/doc/properties.md
• https://github.com/norihiro/obs-face-tracker/blob/main/doc/properties-ptz.md