Fields should support labels, placeholders, and required settings

[kjohnson]

Currently, field labels are implemented as re-purposed placeholders. Instead field's should have corresponding <label/>s in addition to editable placeholder test.

Acceptance Criteria

• Fields have external labels
• Fields have editable placeholders
• Fields can be toggled as required
• Donor name fields have external labels
• Donor name fields have editable placeholders
• Donor name fields can be toggled as required
• Front-end render supports field labels
• Front-end render supports field placeholders
• Front-end render supports field required setting
• Front-end render supports donor name field labels
• Front-end render supports donor name field placeholders
• Front-end render supports donor name field required setting