Remove attacked pawns from storm evaluation

[MJZ1977]

Remove attacked pawns from storm evaluation and make penalty dependent to the rank for blocked pawns.

STC:
LLR: 2.96 (-2.94,2.94) {-0.50,1.50}
Total: 54456 W: 11009 L: 10737 D: 32710
Ptnml(0-2): 929, 6326, 12523, 6444, 1006
https://tests.stockfishchess.org/tests/view/5ec962e4404591b2793008a5

LTC:
LLR: 2.94 (-2.94,2.94) {0.25,1.75}
Total: 62448 W: 9018 L: 8664 D: 44766
Ptnml(0-2): 462, 5928, 18121, 6220, 493
https://tests.stockfishchess.org/tests/view/5ec976a8a586eee45aa2ab40

Non regression STC with "noob_3moves.epd" opening book
LLR: 3.81 (-2.94,2.94) {-1.50,0.50}
Total: 91896 W: 17770 L: 17653 D: 56473
Ptnml(0-2): 1598, 10782, 21124, 10793, 1651
https://tests.stockfishchess.org/tests/view/5ec9b83ea586eee45aa2ab96

Bench 4488597

[anshulongithub]

Test for non regression after rebase with normal opening book for this PR is running here under:
https://tests.stockfishchess.org/tests/view/5ec9b83ea586eee45aa2ab96

[d3vv]

non-regression passed at STC..

[vondele]

I guess it might make sense to see what the result of this test:
https://tests.stockfishchess.org/tests/view/5eca32afa586eee45aa2abc3
is

[xoto10]

My test had a long run but ended up finishing only just yellow:

LLR: -2.95 (-2.94,2.94) {-0.50,1.50}
Total: 186784 W: 37575 L: 37500 D: 111709
Ptnml(0-2): 3388, 21802, 42859, 22033, 3310 

I suggest we merge this more flexible BlockedStorm (yay!) and then people can have a go at improving it further :)

[vondele]

Thanks!