Templates: Added template setup wizard

- Added template setup wizard and integrated it into the template core.
- Added 'mmtemplates#core#EnableTemplateFile'.
- Extended 'mmtemplates#core#Resource'.
- Information can be kept for template files which are currently not
  readable, in case they are later set up by a wizard.
- Split updates for new interface versions into updates of the template
  library and updates of the runtime environment.
- Internal changes.
- Minor improvements.
- Bugfixes.
- Documentation.