(parties are two adjacent dairy operations, and defendant proposed to construct and operate creamery, processing facility and farm store on their property that plaintiff claimed violated an agricultural preservation easement held by the Maryland Agricultural Land Preservation Foundation (MALPF); MALPF determined that proposal was a "farm related use" and permissible with easement; trial court held that plaintiff lacked standing to challenge MALPF decision; trial court decision vacated as plaintiff had standing under third-party beneficiary or charitable trust theories and, as a neighbor, is prima facie aggrieved; case remanded).