* Hacky working prototype.

* Operate with time.Duration offset instead of fixed timestamp.

* Polished the backend code.

* Made a nicer UI component.

* Small refactorings of the websockets code.

* Fixed the backend tests.

* Better websocketing and smoother transitions

* Small styling refactoring.

* Detecting empty topologies.

* Improved error messaging.

* Addressed some of David's comments.

* Moved nodesDeltaBuffer to a global state to fix the paused status rendering bug.

* Small styling changes

* Changed the websocket global state variables a bit.

* Polishing & refactoring.

* More polishing.

* Final refactoring.

* Addressed a couple of bugs.

* Hidden the timeline control behind Cloud context and a feature flag.

* Addressed most of @davkal's comments.

* Added mixpanel tracking.