Build Assimp from source

thirdparty/assimp/test/models/3DS/UVTransformTest/note.txt

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+All 'mirror' files are not absolutely correct. That's mainly 
+because it's difficult convert Max' handling of mirroring to 
+our's.
+
+In other words: TO DO, but only if someone REALLY needs it.
+
+-------------------------------------------------------------
+
+To see how it should look like - test/ReferenceImages
+Note that the viewer has no 'decal' texture mapping mode, so
+the usual clamping is used.

thirdparty/assimp/test/models/3DS/textures.txt

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+All textures are from cgtextures.com and are free for commercial use