actor: Deprecate the pick signal
actor: Deprecate the pick signal

Just like we did for the paint signal; a warning will be emitted if the
diagnostic mode of GLib is enabled through the G_ENABLE_DIAGNOSTIC env
var.

djdeath/clutter,jigpu/clutter,GNOME/clutter,Distrotech/clutter,collects/clutter,jigpu/clutter,djdeath/clutter-android,djdeath/clutter-android,ebassi/clutter,jigpu/clutter,djdeath/clutter,Distrotech/clutter,collects/clutter,ebassi/clutter,heysion/clutter-clone,ebassi/clutter,heysion/clutter-clone,heysion/clutter-clone,Distrotech/clutter,collects/clutter,GNOME/clutter,GNOME/clutter,collects/clutter,jigpu/clutter,collects/clutter,GNOME/clutter,djdeath/clutter,heysion/clutter-clone,Distrotech/clutter,djdeath/clutter-android,djdeath/clutter-android,jigpu/clutter,djdeath/clutter,djdeath/clutter,heysion/clutter-clone,GNOME/clutter,djdeath/clutter,djdeath/clutter-android,ebassi/clutter,Distrotech/clutter,jigpu/clutter,Distrotech/clutter,ebassi/clutter