Purdue Pharma’s quest to settle thousands of lawsuits over the toll of OxyContin and its other prescription opioid painkillers is entering its final phase with the grudging support of most of those who have claims against the company.Nearly two years after seeking bankruptcy protection, the company is scheduled to appear before a U.S. Bankruptcy Court judge to ask for approval of its plan to reorganize into a new entity no longer controlled by members of the wealthy Sackler family, and with profits dedicated to abating the …