Created by: Durman
Addressed problem description
Closes #4283 (closed). It should update nodes reading data from Blender upon changes in the scene. I feel this make work with Sverchok more comfortable in case when workflow include reading data from Blender. Update live operator can be removed.
Preflight checklist
- 
Code changes complete.  - 
Code documentation complete.  - 
Documentation for users complete.  - 
Manual testing done.  - 
Ready for merge.  
