Using commands:
```
glib/gen-unicode-tables.pl -both 12.1.0 path/to/UCD
tests/gen-casefold-txt.py 12.1.0 path/to/UCD/CaseFolding.txt \
   > tests/casefold.txt
tests/gen-casemap-txt.py 12.1.0 path/to/UCD/UnicodeData.txt \
   path/to/UCD/SpecialCasing.txt > tests/casemap.txt
```

Using UCD release https://www.unicode.org/Public/zipped/12.1.0/UCD.zip

.

Signed-off-by: Philip Withnall <withnall@endlessm.com>