* packer: +warnings on implicitMaps, mapNoComps
* packer: known problem: minizip crash, when trying to get file with 2039 year date from disk
* -repack: repacks multiple maps, strips out only required shaders; main argument is single bsp path or txt with full pathes to bsps
switches: -dbg: talkative mode; -png: include pngs, at highest priority; -complevel: -1..10, def 0, compression level
uses additional exclusions file repack.exclude with different logic
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