This property returns true if the accessibility theme is being used, else false.
The accessibility theme is on when either high contrast mode is on or a screen reader
is on, and the 'accTheme' instruction is not set to false in the main scene's markup file.
function accInfo()
{
if (appUtils.accTheme)
shell.print("accessibility Theme is ON");
else
shell.print("accessibility Theme is OFF");
}