[TYPO3-core] RFC: #7957: Enable backend classes for xclassing

[Dmitry Dulepov [typo3]]

Hi!

Steffen Kamper wrote:
> There is the possibility to xclass the backend classes, but private 
> declaration make it impossible to modify.
> 
> I changed class.clearcachemenu.php with a xclass test, for this i attached a 
> unfunctional example extension (in BT), which adds a new item to the 
> cachemenu
> 
> I changed other related with the same issue

+1 and committed.

-- 
Dmitry Dulepov
TYPO3 core team
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