Adds the blackly changed event to the driver
Creates a listener for the block content to change and sets a property
When this.worldTransform is falsy, default to a Mat4 instead of a Vec3
Merge branch 'branch/blockly' of https://github.com/virtual-world-framework/vwf into branch/blockly

Conflicts:
	support/proxy/vwf.example.com/blockly/controller.vwf.yaml