Fix model and textures so that they apply only to the appropriate mesh

[DamSenViet]

All textures are applied indiscriminately to all meshes in the model. Change it so that the textures target specific meshes.

There's a naming scheme that is associated with the model and textures:

enum TextureType {
  Normal = "Nrm",
  Light = "Alb",
  Rough = "Crv",
  Mix = "Mix",
}

type Texture = string; // url of the texture
type ModelName = string; // e.g. FtrMyDesignEasel
type MeshPart = string; // e.g. mBody | mTop
type TextureName = `${MeshPart}_${TextureType}` // e.g. mBody_Crv
type MeshId = `${ModelName}_${MeshPart}` // e.g. FtrMyDesignEasel_mBody

Note that the model folders have been renamed under injected.