Combo changes

- move eval_material to eval-simple.c
- move phase_t to eval.h
- init.c: add eval init
- piece.h: add  piece_midval/piece_endval
- fen.c: add phase calculation
- eval-simple: fix calc_phase

src/chessdefs.h

@@ -79,14 +79,6 @@ typedef enum {
 #define clr_ooo(f, c)    ((f) & ~(CASTLE_Q  << (2 * (c))))
 #define clr_castle(f, c) ((f) & ~(CASTLE_KQ << (2 * (c)) ))
 
-/* game phases
- */
-typedef enum {
-    MIDGAME,
-    ENDGAME,
-    PHASE_NB
-} phase_t;
-
 /* forward defs */
 typedef struct __pos_s pos_t;
 typedef struct __movelist_s movelist_t;