MMExtension | 1.18 Support thanks to @cricri211, MMOItems support, Bending Support

Changelog :

• @cricri211's fork has been used to update to 1.18 👍
• #deprecated{already implemented in default MM with 4.x.x} MMOItems feature to test for handheld item
• Bending with Project-korra checking, test if player has specific bending in mm