(inverse condemnation case challenging the constitutionality of Act 73 on the basis that the Act took oceanfront owners' rights to claim accreted land and declared all such lands to be "state land" and damaged oceanfront owners' remaining property by depriving them of ownership of land abutting the ocean; court vacated part of circuit court's order granting plaintiffs' motion for partial summary judgment which concluded that the Act effected an uncompensated taking of and injury to littoral owners' right to ownership of future accreted land; case remanded to circuit court).