Revert "Custom shader material for line mesh"
Revert "Custom shader material for line mesh"

This reverts commit a39f17e70c4c82b07c7307ae78415d601bb34247.

BabylonJS/Babylon.js,BabylonJS/Babylon.js,sebavan/Babylon.js,RaananW/Babylon.js,BabylonJS/Babylon.js,sebavan/Babylon.js,RaananW/Babylon.js,RaananW/Babylon.js,sebavan/Babylon.js