clutter: Switch to storing device->actor associations in ClutterStage

As planned and prepared with the last commits, let ClutterStage take
care of tracking input devices and their respective actors. This means
we now can remove the old infrastructure for this from
ClutterInputDevice.
13 jobs for device-actors-stage
Status Job ID Name Coverage
  Review
manual #1047371
manual
check-commit-log
manual #1047372
manual
check-merge-request
 
  Prepare
created #1047374
aarch64
build-fedora-container@aarch64
created #1047373
build-fedora-container@x86_64
 
  Build
created #1047376
aarch64
build-mutter@aarch64
created #1047375
build-mutter@x86_64
created #1047378
build-without-native-backend-and-wayland@x86_64
created #1047377
build-without-opengl-and-glx@x86_64
 
  Test
created #1047381
can-build-gnome-shell@x86_64
created #1047380
aarch64
test-mutter@aarch64
created #1047379
test-mutter@x86_64
 
  Coverage
created #1047383
aarch64
test-mutter-coverage@aarch64
created #1047382
test-mutter-coverage@x86_64