[retro-gtk] (12 commits) ...ci: Build and publish the reference manual

[Adrien Plazas <aplazas src gnome org>]

Summary of changes:

  9d3b599... Make the D-Bus API clearly private (*)
  8b3c93e... pixdata: Fix the doc of retro_pixdata_new() (*)
  b4b6d39... version: Give the doc section a better name and title (*)
  1bbb31d... log: Link to the signal in the retro_g_log() doc (*)
  87cec13... pixdata: Document the aspect ratio in retro_pixdata_to_pixb (*)
  9d3b4df... input: Fix %self for @self in doc (*)
  0c333d7... controller: Document RetroControllerInterface (*)
  e137760... Give basic documentation to public sections (*)
  4ac07d6... cairo-display: Give it some private section documentation (*)
  a2ebdff... gl-display: Give it some private section documentation (*)
  9872dcf... Allow building and installing the reference manual (*)
  71f006d... ci: Build and publish the reference manual (*)

(*) This commit already existed in another branch; no separate mail sent