Missing child-src in CspOptions

[DerAlbertCom]

Hi,

i stumbled across some CSP related problem. So i had to dig a littler depper in it, and adapt the IdServer Configuration, all fine.

But, everywhere on the web is stated that frame-src is obsoleted in favor of child-src, but IdServer seems to has no option for that.

Please add child-src to the CspOptions.