[Matahari] Specifying the platform and architecture

The goal with these two properties is to specific what the operating system's wordsize and the processor's wordsize are, respectively. But in thinking about this, is this necessary or can it be done better?

I'm going to suggest that the architecture API on the Host agent go away and instead be replaced with a similar property on the Processor agent. It makes more sense to have it there in the first place.

Platform itself would remain as is and would be more clearly understood with the above change.

Thoughts?