Poxy

- fixed crash with nested C-style enums without a name (39) (tim-janik)
- fixed `POXY_IMPLEMENTATION_DETAIL_IMPL` appearing in HTML in some circumstances

- fixed `ModuleNotFoundError` error in Python 3.12 (38) (dekinet)

- fixed crash when using simple type specifiers in friend declarations (37) (benjaminulmer)
- added workaround for [this issue](https://github.com/mosra/m.css/issues/239) introduced in Doxygen 1.9.7
- added auto-linking for various cppreference.com pages
- made `--bug-report` keep a copy of the original (pre-pre-processed?) XML
- updated m.css

- added config option `excluded_symbols` (a.k.a. Doxygen's `EXCLUDE_SYMBOLS`) (36) (Guekka)

- fixed qualified return types appearing squashed together without whitespace in some circumstances
- fixed performance regression in post-process step
- updated m.css
- minor style fixes

- fixed `'tuple' object has no attribute 'week'` error on Python <= 3.8