Enforce and fix package:pedantic lints (dart-lang/term_glyph#9)

- annotate_overrides
- prefer_single_quotes

Update `tool/generate.dart` to prefer single quotes and add override
annotations. Regenerate files. Fix other cases by hand.
6 files changed
tree: 30f8313144ed37011d40fcc642f193b3d28114cd
  1. pkgs/