Add org.a11y.Status.IsEnabled to return whether accessibility is enabled
Add org.a11y.Status.IsEnabled to return whether accessibility is enabled

Partly implement Frederik Gladhorn's accessibility enabling/toggling
proposal
(https://mail.gnome.org/archives/desktop-devel-list/2011-May/msg00397.html)

Currently only implementing the ability to read the property.  Toggling
via write still TODO.

GNOME/at-spi2-core,GNOME/at-spi2-core,gloob/gloob-s-at-spi2-core,gloob/gloob-s-at-spi2-core,GNOME/at-spi2-core,gloob/gloob-s-at-spi2-core