When this.worldTransform is falsy, default to a Mat4 instead of a Vec3
Merge pull request #175 from virtual-world-framework/branch/fix-default-startWorldTransform

When this.worldTransform is falsy, default to a Mat4 instead of a Vec3
Adds the blackly changed event to the driver
Creates a listener for the block content to change and sets a property
Removes comment and adds some node3 animations