Blender Git Loki

Add texture transform options, Blender version comment.

Two texture transform options, out of several, are supported now:
- Translation (origin offset) (syntax: "-o u v w")
- Scale (syntax: "-s u v w")

For Normal Map textures, Strength (bump multiplier) (syntax: "-bm s")
is also added.

I had to temporarily replace `nodeFindSocket` with its own
implementation to be able to build, since it doesn't accept
`const bNode*` which we're using everywhere.

I proposed a simple fix: D8142 for that. If and when it gets committed,
I'll remove the duplicate code.

Blender version string is also added in the MTL file.

Test file: {F8647881}