Generate code and templates

The creation of templates and specializations are supported in code generation. If both the template and its specialization are in the same package, they are generated into the same file. In the file, the template is generated before its specialization to ensure that the code runs as expected. A check is added to warn that the template and template specialization are in different packages.
Note: If a nested class or attribute is marked as a template parameter, it is not generated.

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