The plugin has now been compiled in java 16, this means it should be good to go for Minecraft 1.17

Added a debug mode. Quite a few people say of inconsistencies with the anvil, and it sometimes not working for combining enchantments. It won't really appear for me though, so I can't really find and fix the issue if I don't see the issue. Debug mode should help with that a bit, debug mode will send the player, if applicable, status messages whenever they try to combine things with the anvil (it will send to console if not applicable). Hopefully this helps in getting bugs fixed.

Made all of the plugin's enchantment fire custom events whenever they trigger. This is only relevant for developers. The events all implement the abstract EnchantmentTriggerEvent, the following subclasses are extended by it:
AttackEnchantmentTriggerEvent (fires for enchantments like Poisoning/Toxic)
BlockInteractEnchantmentTriggerEvent (fires for enchantments like Illuminated)
ConstantEnchantmentTriggerEvent (fires for enchantments like Flight or Blessing)
DefendEnchantmentTriggerEvent (fires for enchantments like Shielding)
EnchantingEnchantmentTriggerEvent (fires for enchantments that only trigger once like Vigorous or Plating)
EntityKilledEnchantmentTriggerEvent (fires for enchantments like Soulbound)
HealthRegenEnchantmentTriggerEvent (fires for enchantments like Vitality)
ItemInteractEnchantmentTriggerEvent (fires for enchantments like Shockwave)
MineEnchantmentTriggerEvent (fires for enchantments like Excavation)
PotionEnchantmentTriggerEvent (fires for enchantments like Potency)

The plugin is considered mostly done at this point, although I still take suggestions/feedback and try to maintain the plugin to the best of my ability. If you find any more bugs or have suggestions, please let me know on my discord or on the spigot discussions page

Any feedback as a review is also very much appreciated