1.8 - 1.17 support and custom checks

Finally support for 1.8 - 1.17 spigot. This version as well is supporting a new custom checks system:

# section for itemstack checks
item-checks:
  # if all checks is true, then other checks won't be working ( all checks is also including nbt check)
  all-checks: true
  # should check item display name?
  display-name-check: true
  # should check item lore?
  lore-check: true
  # should check item enchantments?
  enchantment-check: true
  # should check item flags?
  item-flag-check: true

It's item-based, it can be different for each item.

WARNING: You need to generate new items configs, version is BETA since it's not tested, for any bug reports use our discord or issue system on github.