[cogl-matrix] Adds padding to CoglMatrix
[cogl-matrix] Adds padding to CoglMatrix

This adds enough padding to allow us to potentially add a cache of the inverse
matrix in the future and private flags to annotate matrices.

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