//sets the character at the defined position and returns the previous character.
public GamePiece SetPiece(GridPos pos, GamePiece newchar)
{
GamePiece oldPiece = grid[pos.GetX()][pos.GetY()];
grid[pos.GetX()][pos.GetY()] = newchar;
return oldPiece;
}
public GamePiece GetPiece(GridPos pos)
{
return grid[pos.GetX()][ pos.GetY()];
}