Tree view drag n drop (reparent, move, drag) on touch devices.

[Sirahi]

Is your feature request related to a problem? Please describe.
I am integrating pcui in my project but what stopped me from doing it (for now) is that all the event listeners in panel and treeview are using mouse instead of pointer..

Describe the solution you'd like
To update all the mouse events to have touch support.

Describe alternatives you've considered
To change all the relevant components to use pointer instead of mouse. Not sure if its that simple though.