cally: Fix up event listener registration minimally
cally: Fix up event listener registration minimally

For god-knows-what reason, at-spi is trying various formats
of strings when registering listeners, triggering an ugly

(gnome-shell:4411): Clutter-WARNING **: invalid object type create

warning in .xsession-errors. Stop doing that.

Also don't leak temporary string arrays that are a side-effect
of passing parameters around as formatted strings.

https://bugzilla.gnome.org/show_bug.cgi?id=658721

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