1.1.27-beta

Version bump: 1.1.27-beta (now 1.1 and beta, last number is the build number)

• Images were being duplicated, I've not fixed it yet, but I've made a cleanup script that de-duplicates images with the same filepath in case it happens elsewhere.
• I've added a cleanup operation, like File -> Clean Up -> Recursive Unused Data-Blocks, but it runs the image de-dup first, this mops up a lot of unused data making the .blend file smaller and use less memory.
• Don't process POM materials that don't have a displacement/height map
• Find missing POM textures! Yes, even if the original Blender material, or the in-game material doesn't specify a texture, look to see if it exists with the similar file name and add it in to the POM shader to improve quality. This has picked up a number of ddna, glossmaps and specular textures that were missing before but had been extracted, this generally improves the look of the POM.