Implement item matchers

[Pablete1234]

Change item filters like holding, carrying and wearing with ItemMatchers. Item matchers are a more generic way of matching items, supporting checking ignoring metadata, or amount ranges.

Prior to this, item matching was always exact meta, always ignoring durability, and "at least X" amount matching, this is the default behavior if no extra flags are specified.

Examples:

<holding amount="[3,6]" ignore-durability="false" ignore-metadata="true">
  <item material="wool" damage="0"/>
</holding>

This will match if you're holding between 3 and 6 (inclusive) white wool, ignoring any other metadata (eg: enchantments, renaming, can-place-on, etc).

<holding ignore-enchantments="true">
  <item material="wool" amount="5"/>
</holding>

This will match at least 5 wool (legacy behavior) of any durability (any color) (legacy behavior), and matching exact metadata (eg: name, can-place-on, etc), but will ignore enchantments.

The new available properties are: ignore-durability (default true), ignore-metadata (default false), ignore-name (default ignore-meta), ignore-enchantments (default to ignore-meta).
If ignore-metadata is set to true, ignore-name and ignore-enchantments cannot be false.

[Pablete1234]

Update: rebased ontop of dev

[Electroid]

Yay! 🎉 LGTM