TYPO3 Core

The following patch will be committed in 72 hours if nobody objects.

Type: hardcoded

Branches: trunk, 4.4

BT:

Problem:
t3lib_cache is a v4 only class to initialize core caches. While it reads defined backend and backend options from TYPO3_CONF_VARS, the frontends are hardcoded for unknown reason.

Solution:
Move frontend definitions of core caches to TYPO3_CONF_VARS.

(issue imported from #M15389)