LEXINGTON — Treasurer Jason Whitesel mapped out financial possibilities for the Lexington school board Wednesday night. Lexington Local Schools could end up on solid financial footing — or tumble off a financial cliff — in the next five to six years, Whitesel said. It all hinges on what voters decide Nov. 3 when the district has two tax issues on the ballot. One, a property tax renewal, would not increase taxes. The other is a new, 10-year, 0.75…