New "apitrace diff-state" command

[Carl Worth]

This is the trivial copy/paste of the previously-posted "apitrace diff"
command to invoke jsondiff.py.

The code is in the apitrace-diff-state branch of my repository.

I, for one, will really appreciate having a single binary with a
consistent command syntax to be able to get at all this functionality.

Let me know if you'd like to see anything different or if you'd like any
more code sharing than I have done here so far.

-Carl

-- 
carl.d.worth at intel.com
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