[retro-gtk] (33 commits) Non-fast-forward update to branch stable-api

[Adrien Plazas <aplazas src gnome org>]

The branch 'stable-api' 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:

  050d977... Drop the RETRO_GTK_USE_UNSTABLE_API guard

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 (*)
  3b977ba... flatpak: Drop useless build options (*)
  95923d1... retro-core: Use a weak ref for keyboard widget (*)
  8ca26f4... retro-core: Add missing property getters (*)
  c8534cc... meson: Actually use the 'm' dependency (*)
  959da69... Add RetroMainLoopSource (*)
  b004538... retro-core: Use RetroMainLoopSource for timing (*)
  86c2c85... retro-core: Add 'iterated' signal (*)
  fed306b... retro-core: Add retro_core_get_sample_rate() (*)
  47a2e57... retro-pa-player: Bufferize samples on each frame (*)
  9809681... retro-core: Stop bufferizing samples (*)
  daf663d... meson: Add libsamplerate dependency (*)
  e455ddb... retro-pa-player: Resample audio for non-1 speed rates (*)
  1c0a16c... retro-core: Rename run() to iteration() (*)
  6b3cc1d... retro-core: Rename start() to run() (*)
  dca3c07... retro-core: Remove an extra 'iterated' emission (*)
  a4bdf09... retro-pa-player: Fix resample loop condition (*)
  8be827b... Drop the RETRO_GTK_USE_UNSTABLE_API guard

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