Optimize TH3 lines drawing
Optimize TH3 lines drawing

When possible, reuse vertices from boxes mesh to draw surrounding lines.
Only possible, when number of vertices less than 64K. Reduce memory
consumption. Same can be applied for TH2 drawing.
root-project/jsroot,linev/jsroot,bellenot/jsroot,linev/jsroot,bellenot/jsroot,root-project/jsroot,bellenot/jsroot