Additions

• Add merge to BodyPartManager
• Add morph editor panel API

Changes

• Change morph picker to clone morph on editing (Metamorph)
• Change NBT morph editor max length to 1M
• Change/tidy body part item slot NBT tag
• Change acquiring morph in creative morph menu to allow in spectator mode as well
• Change morph picker scrolling speed

Fixes

• Fix block morph rescale normals (Metamorph)
• Fix empty username crash Metamorph player morphs (reported by Rocket Champion YT and zoombie)
• Fix exceptions raised during creation of an entity (Metamorph) (reported by Olrik&Flynn)
• Fix Ender Dragon morph hurting the player when morphed (thanks to asanetargoss)
• Fix ru_RU, fr_FR, zh_CN and zh_TW from Blockbuster
• Fix/centerize item stack buttons
• Fix body part GUI elements positions (use target, lists and pick morph button)
• Fix use target with entity morphs