Retire KingExposed[] array

And merge its values into KPSQT table.

Passed blazingly fast both short TC:
LLR: 2.95 (-2.94,2.94) [-1.50,4.50]
Total: 5348 W: 1091 L: 971 D: 3286

And long TC:
LLR: 2.96 (-2.94,2.94) [0.00,6.00]
Total: 3029 W: 530 L: 415 D: 2084

bench: 8702197

src/evaluate.cpp

@@ -207,19 +207,6 @@ namespace {
   const int BishopCheck       = 2;
   const int KnightCheck       = 3;
 
-  // KingExposed[Square] contains penalties based on the position of the
-  // defending king, indexed by king's square (from white's point of view).
-  const int KingExposed[] = {
-     2,  0,  2,  5,  5,  2,  0,  2,
-     2,  2,  4,  8,  8,  4,  2,  2,
-     7, 10, 12, 12, 12, 12, 10,  7,
-    15, 15, 15, 15, 15, 15, 15, 15,
-    15, 15, 15, 15, 15, 15, 15, 15,
-    15, 15, 15, 15, 15, 15, 15, 15,
-    15, 15, 15, 15, 15, 15, 15, 15,
-    15, 15, 15, 15, 15, 15, 15, 15
-  };
-
   // KingDanger[Color][attackUnits] contains the actual king danger weighted
   // scores, indexed by color and by a calculated integer number.
   Score KingDanger[COLOR_NB][128];
@@ -653,11 +640,10 @@ Value do_evaluate(const Position& pos) {
         // Initialize the 'attackUnits' variable, which is used later on as an
         // index to the KingDanger[] array. The initial value is based on the
         // number and types of the enemy's attacking pieces, the number of
-        // attacked and undefended squares around our king, the square of the
-        // king, and the quality of the pawn shelter.
+        // attacked and undefended squares around our king and the quality of
+        // the pawn shelter (current 'score' value).
         attackUnits =  std::min(20, (ei.kingAttackersCount[Them] * ei.kingAttackersWeight[Them]) / 2)
                      + 3 * (ei.kingAdjacentZoneAttacksCount[Them] + popcount<Max15>(undefended))
-                     + KingExposed[relative_square(Us, ksq)]
                      - mg_value(score) / 32;
 
         // Analyse the enemy's safe queen contact checks. Firstly, find the