Add compatibility to common formats (PGN, FEN)

[Bonifatius94]

Issue:

• the current implementation uses its' own data structures
• allowing common formats would simplify the interaction with other chess programs

Suggested Solution:

• add a new API function converting a PGN draw into a draw using a chess board
• rework the API function VisualizeDraw() to support PGN output
• add 2 new API functions for conversions between chess boards and FEN strings

[Bonifatius94]

• create Python functions:
  • ChessBoard_FromFen(fen_str: numpy.ndarray)
  • ChessBoard_ToFen(board: numpy.ndarray, is_simple: bool)
  • ChessDraw_FromPgn(board: numpy.ndarray, pgn_str: str)
  • ChessDraw_ToPgn(ext_draw: int)