[Optimization] Optimize GetAllPiecesInRadius

[AlexMog]

Class: Piece

public static void GetAllPiecesInRadius(Vector3 p, float radius, List<Piece> pieces)
	{
		foreach (Piece allPiece in m_allPieces)
		{
			if (Vector3.Distance(p, allPiece.transform.position) < radius)
			{
				pieces.Add(allPiece);
			}
		}
	}