v1.2.4

What's Changed

• Add command.variables as a convenience utility for defining global command variables by @zeroSteiner, @marcinkuzminski and @DannyBen in #563
• Update JSON schema to include command.variables by @EmilyGraceSeville7cf and @DannyBen in #564
• Refactor command.variables to a new Variable object by @DannyBen in #565
• Add black and white to color library by @bguijt and @DannyBen in #567

Full Changelog: v1.2.3...v1.2.4