GitLab

* Refactor visitors into their own header

* Update visitor links in term index

* Move documentation from layers_abstract

* Add Reorg Layer

* Add Reorg Layer

* Fix typo

* fix grammar

* add missing input <-> output mappings to reorg

* Add reorg docs and term index entry

* Update dlib/cuda/tensor_tools.h
Co-authored-by: Davis E. King <davis@dlib.net>

* Add input_rgb_image layer documentation

* fix typo

* Add index entries for missing network visitors

* update Barlow Twins loss links

* add missing yolo rect docs, links to yolo paper and better Barlow Twins formatting

* Add missing docs for v19.23

* remove duplicate yolo entry

* fix link of loss_yolo_ in term_index

The recent change to use a dlib/__init__.py file instead of the dlib.so file directly messed it up.