build: Clean up the configure summary
build: Clean up the configure summary

Split out into section the configuration report, and clean
up the reported settings - including when experimental features
have been enabled.

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