FX.47 Hatch pattern files (.pat) in CadCraft

Asked on Discord by a Discord member: does hatching work, and can .pat files be used? Hatching already worked (16 built-in patterns, scale, angle, origin, islands, associative, and a DXF/DWG file's own patterns). New: the HATCH command has a Pattern file option (F) that reads a .pat file (one or many patterns, comments, dashes and dots), and the patterns can be used by name (P, ? lists them). The hatch keeps its pattern with it, so it still draws on another computer and still takes scale and angle in Properties; DWG save writes its lines. A .pat file has no unit: sizes are taken as drawing units. New file: a Discord member/patfile.js; hatch.js patternFamilies; test: 'Hatch pattern files' (6 checks).

Not done / untested: no pattern picker with previews; a patterns library that stays between sessions (the file is read again next time); a real .pat file from another program (tested with files written to the format only); DXF export still writes the outline only (as for every hatch).