[TASK] Improve performance of array_merge_recursive_overrule

The method GeneralUtility::array_merge_recursive_overrule()
always works on a copy of the given array(s). This is highly
inefficient when it comes to really big arrays and recursion.

This patches moves the functionality into the class ArrayUtility
and changes the behaviour to use a reference to the
original array.
All calls in the core are adjusted accordingly.

Furthermore we deprecate the method in GeneralUtility and
preserve backward compatibility.

Resolves: #54251
Releases: 6.2
Change-Id: I5499905593c2124897de5998be985e546a3d05ee
Reviewed-on: https://review.typo3.org/25986
Reviewed-by: Michiel Roos
Tested-by: Michiel Roos
Reviewed-by: Wouter Wolters
Tested-by: Wouter Wolters
Reviewed-by: Ernesto Baschny
Tested-by: Ernesto Baschny