Let configure alternative draw function

[linev]

After invoking:

   addDrawFunc({
      name: '*',
      func: (dom,obj,opt) => console.log('drawing', obj._typename)
   });

Provided function will be invoked every time when some object is drawn
If function returns value - this will be the only action then

Allows catch and redefine drawing of any object in jsroot.
But TTree::Draw will be performed and only produced histogram
drawing will be alternated

Remove setDrawFunc functionality for hierarchy painter while it is not enough for real use cases

Update hpainter.js demo to show that happens