Flex Conditions

Added support for conditions that must be met in order for the player to flex their held item. The new setting is located under:

  # Conditions that must be met for the item to be flexed.
  # Available Conditions:
  #  pdc: Item must have the specified key in its PersistentDataContainer.
  #   - Format: "pdc,<key>,<type>,<value>"
  #   - Example: "pdc,itemflex:test,STRING,test"
  Flex-Conditions: []

The only available condition at the moment is PDC, more will be coming in the future!

This update also brings a new message that is sent when the item does not meet the flex conditions:

  # Shown when the player tries to flex an item that does not meet the flex conditions.
  Cannot-Flex: "#FF5555You cannot flex that item!"