modification for updating zkless-engine 0.9.0
updates for zkless v0.9.0
updated for zkless0.9.0
refix ZK-2335: grid render performance on the client side (normal vs. renderdefer)
refix B70-ZK-2375
Merge pull request #114 from hanhsu/refix-B70-ZK-2375

refix B70-ZK-2375
* refix B70-ZK-2375