FX.130 CadCraft: DXF R12 export was refused by AutoCAD (dimension styles)

Reported on the Discord: a CadCraft R12 DXF would not open in AutoCAD, which said 'Unknown group 1001 for table' and then 'Omitted group 4'. Cause, in dxf.js: each DIMSTYLE record carried CadCraft's own settings as xdata (1001 CADCRAFT), which R12 tables do not allow, and the record left out groups R12 requires (DIMAPOST, group 4, when the style had no alternate text; also 46, 145, 175, plus a 270 R12 does not have). Now every record lists all the groups R12 lists, once each, in its order (dwg-props.js r12DimstyleItems), and the settings R12 has no variable for travel in a CADCRAFT_DIMSTYLES block the way the classes and Laser panel data do; files written before 0.9 still read. Tested: bin/test-cadcraft.mjs (record layout, round trip, old files). Not opened in AutoCAD here (none on the server): the reporter's AutoCAD is the check.