Model item update

updated the system to allow models to hold items which are able to switch spots on the model.

Notes:

• These items must have no parts labeled as a bone
• Places on the model that can hold items must have a rotation and pivot point of zero and given a named cubed with the sizes of zero.
• The item will take the place of this cube.
• The places are labeled as bones in the model and should be moved in the animations.