LEWISTON, Maine — An independent commission investigating the deadliest mass shooting in Maine’s history is about to hear from more family members of the victims of the tragedy.The commission, established by Democratic Gov. Janet Mills, is reviewing the facts surrounding the Oct. 25 shootings that killed 18 people in a bowling alley and a restaurant in Lewiston. The panel, which includes former judges and prosecutors, is also reviewing the police response to the shootings.Victims who spoke…