Update VJson to v0.9.12

Merge pull request #31 from faidra/export-mesh-with-other-materials-a…

…s-other-mesh

Export mesh with other materials as other mesh

Update package-lock to apply diff that generated under unity 2019.4

Refactor

Suppress glTF warnings

Merge pull request #17 from yutopp/feature/improve_importing_time

Feature/improve importing time

Merge pull request #22 from faidra/fix-emissive

Fix emissive import & export

Fix slice points to prevent resource leaks

Use shaders to export textures for normals, occlusions, matalics

Fix calcuration of normals on DXT5nm