Elo Worth in King Danger

[FauziAkram]

Adding the EloWorth for each term in King Danger.
Should be useful for simplifications, tuning patches, and new ideas.

non-functional change

[ddugovic]

I am curious with each release whether maintainers will keep these data up to date.

[FauziAkram]

@ddugovic it's similar to the elo estimation that we have in search.cpp, it's just a rough estimation, over long period of time the elo worth might vary a little bit, but we don't need to keep it constantly up to date.
Also, I predict that they will stay roughly accurate for quite some time, since we are not having many changes in the classical evaluation lately, and even when we had, king danger does not receive radical changes, just some small tweakings.

[vondele]

I think this is much like the Elo annotations in search. I think these are nice to have (not too fine-grained I would say), and they should only be updated every so often (like search every >1yr). They serve as a useful documentation for further development and tuning IMO.