order-up 0.4.0: pick your character

Added

• Skins. Pick who serves your orders: the chef, a barista (☕ "Coffee's up!", "is brewed!"), a sushi chef (🍣 "Irasshaimase!", "is plated!") or a robot (🤖 "Task complete", "hit an error"). Each has its own character, words, dishes and menu bar icon. Chosen in setup, /order-up set skin …, or /config.
• OrderUp --render-skins out.png draws every character side by side.

Changed

• A project's dish now comes from the skin's menu (a barista serves ☕ and 🧁); your own dish in settings.json still wins.