New Features

• Better support for including alt-textures - Pack creators can now include an alt_items.txt and/or alt_terrain.txt file in their pack. These files are just a simple list of alternative files for terrain and item tiles within the zip. Place each file on it’s own line. See the ones in the included simpletech.zip for examples. 
• Generic Block mode preview for alt-textures - Since I cannot really know what tile is meant for what in an alt texture sheet, I just load them all on a basic block model. (Block in the sample.mdl file) This means that the tiles in an alt-terrain.png don’t have to be in any particular order to still get a preview. (Mind you it also means that multi-tile textures and objects don’t get a custom model.)

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