Lamp v4: Beta 10

Additions

• Added @CommandPriority.Low
• Clean up CommandRegistry and migrate to a user-friendly interface
• Rename CommandRegistry#children() to CommandRegistry#commands()
• Make sure @Switch is only usable on boolean parameters

Kotlin features

• Added support for suspend functions
• Added support for @Optional and nullable parameters
• Added support for @Switch value: Boolean = true/false (default values for switches)

Full Changelog: 4.0.0-beta.9...4.0.0-beta.10