* add .TemplateData property to data in order to populate template <title> tags with the compiled subject value
* update all templates
* re-enable integration test and update implementation to check changes
* chore: fmt
* add HiddenSubject template func and update text templates
* slight performance improvement, only execute subject template once
* update template I missed
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Co-authored-by: Gilles De Mey <gilles.de.mey@gmail.com>