Revert BlockController::getUniqueIdentifier()
Revert BlockController::getUniqueIdentifier()

Revert `BlockController::getUniqueIdentifier()`

`BlockController::getUniqueIdentifier()` is considered unnecessary

- Remove method from core

matt9mg/concrete5,matt9mg/concrete5,MichaelMaar/concrete5,MichaelMaar/concrete5,TimDix/concrete5,avdevs/concrete5,MichaelMaar/concrete5,avdevs/concrete5,TimDix/concrete5,TimDix/concrete5,avdevs/concrete5,matt9mg/concrete5