Add support for/ flesh out a lot of other x86 vendors (Centaur/Cyrix/Rise/Zhaoxin)

[timw4mail]

I'm not going to make this a PR directly, as there are a large number of changes, and PRs are denied by default.

I have a fork here: https://github.com/Dr-Noob/cpufetch/compare/master...timw4mail:cpufetch:retrox86 (I merged in the @danielinux Transmeta changes before I rebased on the most recent changes, I'm not trying to taking credit for those).

I'm willing to split into multiple PRs of more limited scope to make things easier. I have verified CPUs that I've added with real hardware, other than the IDT Winchips (as I haven't been able to get a linux distro to boot on that architecture).