Rework pretty labels
- Move vtkSMProperty::CreateNewPrettyLabel to vtkSMObject::CreatePrettyLabel
- Rewrite it using C++11 and std::string
- Use it in vtkSMProxy to prettyfy proxy names
- Update any deprecated usages
- Improve servermanager.py logic to handle spaced/unspaced proxy names in proxy properties and modify a test accordingly
- Update VisIt bridge to use labels in the proxy definition
- Fix vtkSMDocumentation to cleanup the strings
Edited by Mathieu Westphal (Kitware)