Add TT lookups in quiescence, move TT inside Game, remove redundant occupancy and time limit functions

src/board/fen.rs

@@ -1,6 +1,8 @@
 use crate::board::board::{Board, Color, PieceType};
 use crate::board::game::Game;
 use crate::board::state::{Castle, State};
+use crate::search::transposition_table::TranspositionTable;
+use crate::search::MAX_TT_SIZE;
 use String as FenError;
 
 pub fn from_fen(fen: &str) -> Result<Game, FenError> {
@@ -34,11 +36,12 @@ pub fn from_fen(fen: &str) -> Result<Game, FenError> {
         history: History::new(),
         mailbox,
         hash,
+        tt: TranspositionTable::new(MAX_TT_SIZE),
     })
 }
 
 pub fn piece_placement(pieces: &str) -> Result<Board, FenError> {
-    let mut board = Board::empty_board();
+    let mut board = Board::new_empty();
     let (mut file, mut rank): (u8, u8) = (0, 7);
 
     for c in pieces.chars() {