closes#5762
- changes date to use proper inline validation
- changes meta_title & desc to also use inline validation
- meta_title & desc also give proper errors on save
- title too long causes proper error on save
closes#5336
- creates gh-form-group component to handle form group status
- refactors current validation methods to work on a per-property basis
- adds gh-error-message component to render error message
- removes (comments out) tests that pertain to the old notifications until the new inline validation is added
