interactive/layout: Update to modern API
interactive/layout: Update to modern API

No need to override Container. Actually, no need to use the Container
API at all. This also removes a bunch of leaks.

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