Mouse over data display using floating div

Child of #1020
As a user I want the ability to hover my mouse cursor over a track so that I can see all the values at that particular point for all the components in the track.

Acceptance Criteria:
1. As a user moves the mouse cursor over a track, a horizontal line across the tracks within a widget should be seen based on cursors location
2. All the values for various components (Line, Fill etc) should be shown on the header or top of the track.
3. As a user moves the cursor along a track the values of the header should update dynamically
4. The cursor should work across a widget in multiple tracks as well