[TYPO3-core] RFC: #9575: use native filter_functions for validate and sanitize

[Steffen Kamper]

this is a SVN patch request.

Type: Feature (Enhancement)

Bugtracker references:
http://bugs.typo3.org/view.php?id=9575

Branches: trunk

Since PHP 5.2 the filter_functions are built-in.

This gives the opportunity to use this native functions as they are more 
easy and faster.
I changed / added these to t3lib_div

changed functions:
validIP / validIPv4 / validIPv6 / validEmail

new functions:
validUrl / cleanUrl

vg Steffen
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