New placeholder text atribute for fields

[barrymavin]

I've added a new attribute for form fields; "Placeholder text". The specified text is displayed as grayed-out placeholder text as long as the field is empty and doesn't have focus.

Small but useful enhancement to provide a visual cue for users filling in forms without having to hover over the field with the mouse to show a tooltip.

[dcipher]

That will be very useful.

Thanks