* wip implementation
* maybe add tests...
* fix dependencies
* fix windows and mac deps
* attempt #3 for mac deps
* add --break-system-packages because WHY NOT
* add raii wrapper for curl_slist and curl_mime
* add content_type; fix incorrect recipient variable; more tests
* put smtpd log in file; add curl_easy_setopt_return_error; fix parsing email from display string
* remove some debugging
* catch exceptions in polsys::ReloadConfiguration; tests; smtpd cleanup
* Fix xslt validation erorrs in osem.xml
- `HTTPRequest`` did not have the `<code>` block inside `<explain>` so
it was not rendered.
- `LoadExportedScript` needed `<return>` after `<explain>`
- `GetEnvironmentVariable` needed `<return>` after `<explain>`
* Address review comments
- remove openssl test dep by generating cert, valid for 100 years
- only run test if asiosmtpd module is installed
* Address review comments
- remove `pChild`
- remove `curl_easy_setopt_return_error` macro
- return `new BLong( 0 )` for temp object replaced by background thread
* Address review comments
- use `Clib::localtime` + `fmt::format` for date header
* Address review comments
- Early exit on failures
* Address review comments
- Move suspend to immediately before background thread creation
* Address review comments
- better handling of curl_slist and curl_mimes
* Address Discord comments
- remove env check in test_email program
* attempt to fix timezone issue in date header
* additional tests for invalid params
* add docs, core changes
* smtpd: fix event loop, only run if not filtered out
* put stacktrace in "no signal received" error
* fix stacktrace call in testutil; add default param to os.environ.get in smtpd
