v0.0.1-SNAPSHOT for 1.21.4

Added configurable options:

• easy disable flight hotkey, like 'space' in bedrock edition
• swap elytra/ chestplate hotkey
• boost instead of placing firework on block in flight
• firework hotkey, triggered in flight only
• flight overlay
• firework rocket count
• alert when elytra have low durability
• auto replace elytra when old elytra breaks