Created by: GeneralPancakeMSTR
Addressed problem description
#4575 (closed) Add Catmull-Clark subdivision to Sverchok
- Renames "OpenSubdiv" node to "Catmull-Clark Subdivision"
 - Improved stability, particularly level 0 subdivision on topology without quads is handled a lot better, along with subdivision <= 0 in general.
 
Preflight checklist
Put an x letter in each brackets when you're done this item:
- 
Code changes complete.  - 
Code documentation complete.  - 
Documentation for users complete (or not required, if user never sees these changes).  - 
Manual testing done.  - 
Unit-tests implemented.  - 
Ready for merge.