Summary
- towards UTF-8-Isabelle symbol encoding;
- updated to VSCode 1.65.0;
- clarified char symbols: cover most European languages;
- more elementary Symbol.Matcher without detour via Regex (see also Pure/General/symbol_explode.ML);
- tuned comments; tuned imports;
- more robust dependencies: avoid implicit update, escpecially of underlying vscode engine;
- proper file headers;
- added count_list lemmas