Fix CMS: Rearrangeable array elements #230

[xy9iao]

Fix #230: Enable reordering in EditorArrayNode

Changes Made:

• Added Move Up / Down buttons to allow users to swap items
• Make sure UI update after swapping elements: Forced React to re-render components using key to ensure changes are reflected

Reason for forcing re-rendering:

• After transforming the previous data to the new location, only the image data re-renders. The Name and Room parts remian the same on UI
• Had to force re-rendering using:
  key={`${index}-${version}`}