Add SteamCMD ipv6 check

[akirilov]

Describe the bug
Steam fails with code 0x2 due to ipv6 issues

To Reproduce
You know how...

Recommendation
We should add a warning if we detect that steam failed with code 0x2 and the user has ipv6 enabled -- this seems to often be the culprit

[JacksonTheMaster]

I really should've added this when I added a check if steam failed with exit code 8 in 5.10