[TYPO3-mvc] Backport FLOW3 var_dump

[Sebastian Kurfürst]

Hey,

Overall, it's great work :)

I've been looking at the diff, and have one remark:
- To determine if an object is singleton or prototype, you should not
use the @scope annotation in v4, but instead check if it implements
Tx_Extbase_DomainObject_AbstractEntity / ...ValueObject.

I'll add it to extbase during the next week.

Thanks for your really nice work :)
Sebastian