gre-42

Results 3 issues of gre-42

### Issue or RFC Endorsed by Maintainers [Enable WebSockets #20](https://github.com/etr/libhttpserver/issues/20). ### Description of the Change Added websocket support. ### Alternate Designs Extending the existing `http_resource` class was considered, but rejected...

This PR decreases the runtime of optimization when `ax_neg_safe == -ax_pos_safe`.

std::aligned_storage is deprecated in C++23 and should be replaced with the code as shown in [1] and [2]. [1] [Why is std::aligned_storage to be deprecated in C++23 and what to...