1. Implement 'p' and 'p0' drawing options for TH1 2. Further improvements with drawing optimization 3. First try of drag-and-drop functionality for drawing superimpose 4. Handle attributes like TAttLine, TAttMarker, TAttFill at central place, use d3.call() functionality to apply attributes

Signed-off-by: Bertrand Bellenot <bertrand.bellenot@cern.ch>