Add Fence Gate custom renderer, and switch vanilla to using it
Shift load order, so that external files supercede internal ones for mod support
Fix load order on external vs internal texture files
Make MC version: check more flexible (1.6 matchex 1.6.x)
Add better debug for texture file tile indexes exceeding count for file
Avoid loading texture resources that are unused in mod configuration
Fix loading of special tiles in vanilla (snow sides, etc) - not refereed to directly, so not loaded properly with load-when-needed optimization