Need to fix assimp meshes loading at 0, 0, 0

[greeenlaser]

Basically right now the engine is limited to loading models with only one combined or single mesh, loading a model with separated meshes loads each mesh as a new gameobject. What we need is to figure out how to actually get the true position of each mesh when its imported, then the placeholder "separate gameobject per mesh" thing can be removed and separated meshes can be imported all as one gameobject.

New child meshes are created as gameobjects here:

Elypso-engine/Engine/src/engine/graphics/shapes/model.cpp

Line 138 in e876ca9

shared_ptr<GameObject> newChild = ModelChild::Initialize(