public HexUnit AddUnit(HexUnit unit, HexCell location, HexDirection direction)
{
units.Add(unit);
unit.transform.SetParent(GameManager.instance.grid.transform, false);
unit.Grid = GameManager.instance.grid;
unit.Direction = direction;
unit.TeamIndex = teamIndex;
unit.SetColor(teamColor);
// Update location last as it updates visibility
unit.Location = location;
return(unit);
}