Feature/material-export

[paishoexpert]

Feature/material-export

• Removed the "withMaterial" export type and replaced it with a boolean that applies to all mesh export types (WithRig, MeshOnly, Multimesh).

This works perfectly for WithRig and MeshOnly, but creates a 'problem' with Multimesh:

• The Blender plugin reads the Material.json from top to bottom and applies materials to meshes in that exact order.
• An occurence of two submeshes (submesh_00_LOD_0 and submesh_00_LOD_0.001 (technically last mesh in MultiMesh)) would lead to a incorrect order on import as it'd be imported as the second mesh and thus materials being applied wrong.
• To counteract this I've just added a small prefix, which keeps the order intact on import. That prefix is only applied for Multimeshes and only if "Export materials" is ticked.

If someone was now to reimport this exported multimesh object (to for example replace a part of a jacket with some other part of a different jacket) - he'd need to organize the submeshes correctly and then remove the artifically added prefix. If I am not mistaken.