[TYPO3-core] RFC: Extend TypoScript values

[Michael Stucki]

This is a CVS patch request.

Problem:
TypoScript properties cannot be changed unless they are completely
redifined.

Example:
lib.mymenu.pidlist 
Adding more IDs is not possible without redefining the whole property again:
lib.mymenu.pidlist 
The same goes for removing elements:
lib.mymenu.pidlist 

Solution:
Introduce special properties that extend existing values.

Example (compare with the above one):
lib.mymenu.pidlist lib.mymenu.pidlist._addToList lib.mymenu.pidlist._remoeFromList 

Comments:
- The feature was written by Ingmar and me during the snowboard tour.
- We have added four methods (addString, removeString, addToList,
  removeFromList) but more should be easy to implement.
- We would like to add some kind of a hook to add more methods dynamically
  (but that follows later).
- It works fine in regular TypoScript setup as well as in Page TypoScript


Documentation is still missing but I am not yet sure where it needs to be
added (will check with Kasper).

Comments welcome.

Regards, michael
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