Correctly handle contextmenu events for TGeo in Chrome/IE
Correctly handle contextmenu events for TGeo in Chrome/IE

These browsers issue conextmenu event when right button is released,
other browser normally produce event when pressing right-button
root-project/jsroot,linev/jsroot,bellenot/jsroot,linev/jsroot,bellenot/jsroot,root-project/jsroot,bellenot/jsroot