Add compound field components

[itaanng]

• Dimensions
• • Side-based (Top/Left/Bottom/Right)
• • Axis-based (X/Y)
• • Link values
• Link
• • URL
• • External link
• File
• • Src
• • Alt
• • Title
• • Caption
• • Description
• Group
• • Children (primitive array)
• • Repeater
• • • Min
• • • Max
• • • Labels (Add/Remove/Empty)