Fixed castling, added castling export to FEN

+ isFreePath implementation in Piece
- Removed isFreePath from Bishop, Rook, Queen and King
+ canCastleKingside and canCastleQueenside methods in King
+ Castling rights record in Board + FEN export

+ equals method in Position
+ UCI 'position startpos' command
- Switched to Java 8 compliance for compatibility reasons

test/dev/kske/chess/test/BoardTest.java

@@ -7,6 +7,7 @@ import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.Test;
 
 import dev.kske.chess.board.Board;
+import dev.kske.chess.board.Move;
 import dev.kske.chess.board.Piece.Color;
 import dev.kske.chess.board.Queen;
 
@@ -38,6 +39,8 @@ class BoardTest {
 		assertNotSame(clone.getBoardArr(), board.getBoardArr());
 
 		clone.getBoardArr()[0][0] = new Queen(Color.BLACK, clone);
+		clone.move(new Move(1, 1, 1, 2));
 		assertNotEquals(clone.getBoardArr()[0][0], board.getBoardArr()[0][0]);
+		assertNotEquals(clone.getActiveColor(), board.getActiveColor());
 	}
 }