create block models other than OBJ + MTL format

Won't fix
MCreator version
Issue description

Hello, for my mod, I tried to create a custom block model. I used my 3D modeler but I discovered that you can only import a 3D model with the OBJ + MTL format,
I do not understand why ! I tried to import my model in OBJ but I couldn't get the MTL file. So I couldn't create my block. Could you add the means to import in java?

Issue comments

Even OBJ model is very limited. If you are interested in more model types to support, open a pull request to the MC Forge project to add another loader to it.

Use JSON models that are standard Minecraft models and should be used in 99% cases.

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