[TYPO3-core] RFC: Fix #7657: Add hook to $TSFE->contentStrReplace()

[Michael Stucki]

This is a SVN patch request.

Problem:
This method allows to overwrite markers in a fully generated website after
all the caching was already done. So this is very useful for small
on-the-fly replacements, for example display the fe_user name, or the time
used for page generation.

Solution:
Add a hook which will allow extensions to use this very useful feature.

Comments:
$TSFE->contentStrReplace() cannot be used if cacheHeaders are enabled.
However, this was already the case before this patch.

Bugtracker reference:
http://bugs.typo3.org/view.php?id=7657

Branches: TYPO3_4-2

- michael
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