add function for converting descent 2 texture numbers back to descent 1 texture numbers
Enable global structs for mine saving functions
move old per-file change logs into new file ChangeLog-old
remove some unneccesary globals
comments/formatting
fix loading of d1 texture replacements for non-animated textures
if descent.pig available, load d1 textures for d1 levels
more d1 level loading stuff
load d1 levels
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