Adjust canvas drawing for TWebSnapshot case
Adjust canvas drawing for TWebSnapshot case

In this mode primitives list is ignored and snapshot is used.
Canvas UI elements created only when websocket is connected and first
object version is obtained.
linev/jsroot,root-project/jsroot,bellenot/jsroot,bellenot/jsroot,root-project/jsroot,linev/jsroot,bellenot/jsroot