emul_ppc.cpp: complete instruction set about sheepshaver

[ianfixes]

I'm not sure whether there is any logical grouping to these instructions, but since I doubt anyone is likely to implement them all in a single pull request it would be acceptable to break this into smaller issues and close it. That doesn't need to happen until someone is prepared to tackle the development itself and can (hopefully) decide what those groupings should be.

[retokromer]

We could switch the [ ] to[x] here when an instruction is implemented. I am not planning to do all myself, but a few should be present, in my opinion, and I volunteer to implement those.

[ianfixes]

Understood. Still, I think only you (and I, as admin) would be able to actually change the boxes from unchecked to checked.

Which is essentially me saying "I'm optimistic that we are going to get a lot of contributors implementing all of these instructions..." So, probably not a big deal.

[retokromer]

If you wish so, then of course I can try to split the current 74 instructions into a set of logical groups.

[ianfixes]

@retokromer please do recreate this issue as multiple issues on https://github.com/emaculation/macemu/issues, broken into logical groups. My nightmare scenario here would be that github repeatedly closes this issue via PRs and we repeatedly re-open it.