Implement sys_ipmimgr_call

[SuchAFuriousDeath]

[mikusp]

I've started reversing that call already - I'm not sure to what extent it's used by commercial software, so I'll start with what's used by libSceNpManager's .init

[SuchAFuriousDeath]

By the way, just in case it's not obvious, you don't have to implement it fully, just the branches that are actually ran, we do it like that in a lot of places already.

[mikusp]

I know, even that is a lot of code 🥲

[SuchAFuriousDeath]

Does the branch that's ran actually return something?

[mikusp]

Looks like that is the case, they seem to expect some kind of resources to be returned, in addition to returning success from the call itself. I've stubbed like 4-5 commands and it seemed to progress further (then stuck on kern.sdk_version sysctl).

[SuchAFuriousDeath]