ENH: Inject register tags for UI/non-email templates

## Is your feature request related to a problem?
Currently, some templates include control register tags based on the type of template. In some cases, the module injects register tag(s) as well. Templates should not have to include any register tags.

## Describe the solution you'd like
Always inject the forums DLL register tag with prefix "af" as this supports legacy templates.
Always inject DNN DLL register tag if unauthenticated to support using captcha control.
For other non-email templates, inject appropriate control register tags based on tokens used in each template type. For example, inject the register tag for the search control when loading a template than can include the search control.