Added undo and redo icons.
Added other type of arrows.
Added box icon.
Added document icon.
Added window(s) icon.
Added other type of window(s).
Added other types of documents.
Added share icon.
Added attach icon.
Added refresh icon.
Added delete icon.
Added other types of plus, minus, info, help icons.
Added other type of clock icon.
Added list icon.
Added flag icon.
Added movie icon.
Added cloud icons.
Added picture icon.