[TYPO3-core] RFX: #9286: use native JSON-methods instead of 3rd party json script

[Steffen Kamper]

Hi Benni,

Benjamin Mack schrieb:
> Hey Steffen,
> 
> very nice! Question: Should we convert the json data back to the initial 
> charset on return?
> 

of course, this would be a logic step.

vg Steffen