Miranda Lambert‘s always had a flair for revenge songs. She made her name with scorchers like “Kerosene” and “Gunpowder and Lead,” and as she’s aged, that vengeful streak never went away — it just got a little more subtle. In her new single “Dammit Randy,” for example, Lambert takes the high road instead of going scorched earth: She understands she’s outgrown a lover, and simply moves on instead of showing her anger with flames or firearms. It looks like the breakup songs won’t be slowing down as she heads towards her next album cycle: The singer has been teasing an unreleased new track called…