settings: Add password-hint-time property
settings: Add password-hint-time property

Add a setting that controls whether ClutterText actors in password mode
should display the last input character for a defined time. This helps
on touch-based interfaces.

https://bugzilla.gnome.org/show_bug.cgi?id=652588

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