Change normalizeFeature's algorithm.

Signed-off-by: Anurag Priyam <anurag08priyam@gmail.com>
Changes to drag n drop code to work with normalizeFeature.

Signed-off-by: Anurag Priyam <anurag08priyam@gmail.com>
Change ScratchPad semantics and store helpers in EditTrack.

* Ensure features rendered in EditTrack are in the order they appear in the
  store.
* That ordering is retained after an edit action.

Signed-off-by: Anurag Priyam <anurag08priyam@gmail.com>