Ability to upload .fbx character models locally#270

The ability to upload your own poseable .fbx model (assuming the skeleton structure is correct according to the documentation) into the webapp. If, for example, someone has edited the ‘working character model’ (with different proportions, different limbs ect ect), there should be a way to upload it to the scene locally, so that uploading to a server wouldn’t be needed.

Perhaps an additional library of models made by users that have been tested and approved by the dev team? This would eliminate all the requests for a specific character model or specific addition to a character model, assuming folks can just upload it themselves.