Implemented the required/regex validation that is applied to PropertyType's on a Document type (this might be temporary if we get around to implementing pre-value overrides). Changed the name from ManifestValueValidator to just ValueValidator and allows for property editors to override the defaults if they need to change how the regex/required validation is processed against the property's value. Have streamlined all of the validation directives to require an FormController which we then listen to. Have removed valBubble as we don't actually need that functionality anymore and this simplfies input elements too.