[retro-gtk] (18 commits) Non-fast-forward update to branch retro-screen

[Adrien Plazas <aplazas src gnome org>]

The branch 'retro-screen' was changed in a way that was not a fast-forward update.
NOTE: This may cause problems for people pulling from the branch. For more information,
please see:

 https://wiki.gnome.org/Git/Help/NonFastForward

Commits removed from the branch:

  ffdc4db... 🤷
  2474daf... 🤷

Commits added to the branch:

  4ec4082... Bump API version to 1 (*)
  44b59fc... retro-core: Don't allow to set non-writable properties (*)
  1216400... retro-core: Stop constructing the object in new() (*)
  a54bfc0... retro-controller: Add get_supports_rumble() (*)
  cbd1b4d... retro-controller: Remove poll() (*)
  a7ff5d9... retro-controller: Add 'state-changed' signal (*)
  893c463... retro-core: Remove return result from message signal (*)
  67ec368... retro-core: Remove return result from shutdown signal (*)
  e7349b2... retro-core: Add retro_core_override_option_default() (*)
  8792b95... retro-core: Remove options-set signal (*)
  5e7e474... retro-core: Rework state and memory API (*)
  56d981a... retro-main-loop: Merge into RetroCore (*)
  e497487... retro-core: Don't allow negative speed rate (*)
  41c10ce... core: Use g_object_notify_by_pspec() everywhere (*)
  602617a... retro-core-view: Remove an unused function (*)
  c65b2de... environment: Return the played samples in on_audio_sample_b (*)
  58930ff... 🤷
  ea5ef3f... 🤷

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