Revised CPUID/cache info - for review

[Don]

The attached code is a revision of my cache detection code, and also 
serves as a replacement for std.cpuid.
With the 'toString' function removed, it should also be suitable for 
Tango, as it has no dependencies and generates no heap activity.

It fixes several problems with std.cpuid. Most importantly, it works for 
non-Intel/non-AMD X86 processors (yes, they do exist), and has a 
reasonable degree of future-proofing.
I've removed some bad-practice functions (eg, you should NEVER test if 
the vendor is Intel) and replaced them with more appropriate ones.

I've included stubs for PowerPC and Sparc, and most of the logic should 
also work with Itanium.

But I don't have much free time, and the code is rather messy.
Please confirm that it works on your system. If anyone has the time to 
tidy it up, that would be most appreciated.

-Don
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