importOutlines can't handle some Unicode filenames

[Tom Chen]

In batch_import_svg.py,

[...]
glyph.importOutlines("SVG\161 ¡.svg")

will raise an error:

UnicodeDecodeError: 'utf-8' codec can't decode byte 0xa1 in position 8: invalid start byte

This Unicode related issue may, although not exactly, refer to fontforge/fontforge/issues/3058

[Tom Chen]

This may or may not relate to #2

[Tom Chen]

Initially I wanted to keep the glyph file name as it is to make the file name informative and human readable, but it could indeed raise many Unicode related problems.

So I decided to completely stop using special Unicode file names and changed artboard names in .ai (and subsequently changed SVG glyph file names), e.g. 305 ı.svg is now 305 dotlessi.svg. The file name is less readable this way, but still readable.

See /other_files/font_template-glyph_list-char-dec-filename_table.txt for details. The files are named as

[Decimal_Code] [AGL_Glyph_Name].svg

except for 0-9 whose AGL glyph names are "zero", "one"... but I keep using "0", "1"...

Users should follow the "Update your font_template.ai before 2020-08-19" section in the tutorial.