New Features
- Added syntax highlighting for COBOL, Dotenv, Proto, GraphQL, reStructuredText, and Nginx.
- Added extension and dotfile mapping for .cob, .cbl, .cobol, .env*, .proto, .graphql, .gql, .rst, and .conf.
- Added language picker entries for the new languages across toolbar and command menus.
- Added sample fixtures for manual verification of new language detection and highlighting.
- Finder/Open With now opens files in the active window when available.
- Added macOS document-type registration for supported extensions.
Full Changelog: v0.4.2-beta...v0.4.3-beta