Poxy

- added basic `using` alias detection to syntax highlighter
- added missing badges for C++23, 26 and 29

- fixed sorting of namespace and group members
- fixed m.css failing with new versions of doxygen due to `Doxyfile.xml`
- added google structured data to `\pages`

- fixed formatting of `<meta>` tags
- added config option `author`
- added config option `robots`
- added markup tag `[p]`
- added markup tag `[center]`

- added config option `macros`
- added command-line option `--version`

- Improved handling of m.css and Doxygen warnings and errors
- added command-line option `--doxygen`
- added command-line option `--werror`
- added markup tag `[set_parent_class]`
- added markup tag `[add_parent_class]`
- added markup tag `[remove_parent_class]`
- added config option `images`
- added config option `examples`
- added ability to specify tagfiles as URIs

- fixed some minor autolinking issues