[TYPO3-core] RFC: Add user function support to Constant Editor

[Ingo Renner]

This is a SVN patch request.

Problem:
The constant editor offers a limited set of configurable input types

Solution:
add a new type "user" so that extension authors can add new input  
types as needed

Comments:
Patch provided by Jeff Segars, I just did some minor clean up

Bugtracker reference:
http://bugs.typo3.org/view.php?id=6169

Branch:
Trunk only

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Ingo
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