[plenarius]

The game's compiler leaves the mesh lightmapped byte (+500) uninitialised, and its ASCII parser reads no lightmapped keyword (nwn-mdl-spec MDL-BIN-051, MDL-ASCII-070). cleanmodels decompiled the garbage byte to a lightmapped N line (often 253) and compiled it back.

Now:

• the decompiler skips the byte, and the writer emits no lightmapped line;
• the parser accepts the keyword and ignores it, as it does center (no warning: every ASCII file older cleanmodels versions wrote has the line);
• the compiler writes 0.

Ported to python/.

Testing (in-game test waived by the user; the game never reads the byte):

• go test ./... passes, plus TestLightmappedIgnored: a lightmapped 253 line changes nothing in the compiled bytes, and nothing is decompiled back.
• Corpus parity on the game's 32,832 models passes: decompile, parse and compile. Go and Python give the same decompile warnings and notes on all 25,597 binaries.
• Against v4.11.0's decompile, 651 files change. The only change is 4,555 removed lightmapped lines.