Fixes Issue 1673 - Implement the isTemplate trait.
Merge pull request #3380 from AndrejMitrovic/isTemplate

Issue 1673 - Implement the isTemplate trait.
Add Nspace into Visitor
Add TemplateParameter and its derived classes into Visitor
Add Condition and its derived classes into Visitor
Add Parameter into Visitor
Merge pull request #3856 from 9rnsr/fix_visitor

Add Nspace and others into Visitor