Clean up chainparams some more.
Clean up chainparams some more.

Clean up the code in chainparams a bit more after the recent
refactorings.  In particular, make sure the structure of the "RegTest"
params matches the structure of the other classes.  This makes the code
clearer to read.

Also remove redundant values of the genesis block in always-specified
optional arguments and mark variable/argument as "const".

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