createTemplateProcessor
Creates a new instance of a template processor for this rendering strategy. A template adds static content to the output code, and supports injection of values via placeholder keys, like a template file. For example, an HTML wrapper may add <html><head>...</head><body>...</body></html>, with the content injected in body. See resources/render/html-wrapper.html.template for an HTML template.
Return
a new instance of the corresponding template processor