Trackable Collection API

[tonysneed]

From @tonysneed on September 10, 2017 14:9

• tracking property (boolean): set up or tear down listeners and proxy handlers (recursive).
• getChanges: return changedEntities private field (non-recursive).
• acceptChanges: set state to Unchanged, clear deletedEntities cache (recursive)
• revertChanges: write original to current values, accept changes (recursive)
• mergeChanges: merge updated graph into tracked graph, accept changes (recursive)
  • requires IMergeable interface with entityIdentifier (string-guid).

Copied from original issue: TrackableEntities/trackable-entities-js-poc#13