Started in #429, GLOBAL_tint is right now controlled by 3 material properties, the checkbox and their values. There does not appear to be a validation that every material's copy has to be the same. Instead of making a validation we'll take those three properties and bring them to the OBJ settings.

• Unit test like in Idea: Header directives should not be block level properties #429
• Code like in Idea: Header directives should not be block level properties #429
  etc