[script] Fix the default deserialization
[script] Fix the default deserialization

Properties parsed from ClutterScript should now use G_TYPE_INT64
and automatically convert between G_TYPE_INT and G_TYPE_INT64.

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