script: Use JsonObject direct accessors
script: Use JsonObject direct accessors

Instead of getting the JsonNode for a member of which we mandate
the type we can use the typed accessors of JsonObject.

Distrotech/clutter,collects/clutter,spatulasnout/clutter,djdeath/clutter,heysion/clutter-clone,GNOME/clutter,ebassi/clutter,dlespiau/clutter,spatulasnout/clutter,djdeath/clutter,spatulasnout/clutter,rkudiyarov/clutter_osx,collects/clutter,jigpu/clutter,jigpu/clutter,djdeath/clutter-multithreaded,GNOME/clutter,djdeath/clutter-android,rkudiyarov/clutter_osx,Distrotech/clutter,nobled/clutter,Distrotech/clutter,kerrickstaley/clutter-vala,rkudiyarov/clutter_osx,djdeath/clutter-android,djdeath/clutter-android,ebassi/clutter,Distrotech/clutter,GNOME/clutter,nobled/clutter,djdeath/clutter-multithreaded,djdeath/clutter,heysion/clutter-clone,kerrickstaley/clutter-vala,heysion/clutter-clone,dlespiau/clutter,kerrickstaley/clutter-vala,jigpu/clutter,collects/clutter,djdeath/clutter,jigpu/clutter,djdeath/clutter-multithreaded,djdeath/clutter,djdeath/clutter-multithreaded,ebassi/clutter,Distrotech/clutter,spatulasnout/clutter,heysion/clutter-clone,GNOME/clutter,jigpu/clutter,nobled/clutter,djdeath/clutter-android,kerrickstaley/clutter-vala,djdeath/clutter,ebassi/clutter,dlespiau/clutter,GNOME/clutter,jigpu/clutter,djdeath/clutter-android,Distrotech/clutter,ebassi/clutter,collects/clutter,collects/clutter,spatulasnout/clutter,heysion/clutter-clone,rkudiyarov/clutter_osx