Modular Entity Enhancements

[M1thieu]

Implement additional features to streamline and finalize the creature assembly system, enhancing usability and aesthetic configurations.

• Automatic Attachment of New Parts: newly added body parts should automatically connect to last socket, minimizing manual steps.

• Export Functionality for Finalized Creatures: Save the creature as a new scene, free of plugin components, ready for gameplay.

• Cosmetic Attachment Menu: A separate menu for adding non-bone cosmetic parts (like antennae, mandibles) for customized aesthetics.

• Full Support for Basic Inverse Kinematics (IK): Ensure IK functionality is working seamlessly for realistic limb movement.

• (Optional) Mirror Part Option for Symmetrical Limbs: A mirror option to automatically duplicate limbs symmetrically, ideal for multi-limbed creatures, hello caterpillars.

[M1thieu]

Hopefully along this issue that would means that we will get some "gameplay" a bit rough yet we'll be able to at least see something concrete if this takes form!