Christmas Release (v2.1.0-menu)

What's Changed

• Added settings menu including scale option and custom bbox input by @louis-e in #91
• Force dark theme by @louis-e in #92
• Added winter mode by @louis-e in #93
• Check session lock before selecting world by @louis-e in #94
• Add floodfill timeout support by @louis-e in #95

Full Changelog: v2.1.0...v2.1.0-menu