Allow to configure prefix oder suffix with TypoScript

[sebkln]

By default, the human-readable fragment is prefixed with the content element's uid, like c35-section-of-interest (learn why).

Some configuration settings in TypoScript would allow to simplify several Fluid templates, where the prefix and fragment are currently put together manually.

These new settings also are a prerequisite for getting human-readable fragments in RTE links and TCA link fields (#5) (like header_link).

Currently, I'm evaluating to what extent the planned configuration needs to support stdWrap functions (which I'd then need to implement in the modifyPageLinkConfiguration() hook as well).

If you're using this extension and used other data as a prefix or suffix, I'm interested in your use case!