Favicon, SMTP and misc updates

Favicon:
- Replaced HTML tokenizer, much faster now.
- Caching the domain blacklist function.
- Almost all functions are async now.
- Fixed bug on minimizing data to parse
- Changed maximum icon download size to 5MB to match Bitwarden
- Added `apple-touch-icon.png` as a second fallback besides `favicon.ico`

SMTP:
- Deprecated SMTP_SSL and SMTP_EXPLICIT_TLS, replaced with SMTP_SECURITY

Misc:
- Fixed issue when `resolv.conf` contains errors and trust-dns panics (Fixes #2283)
- Updated Javscript and CSS files for admin interface
- Fixed an issue with the /admin interface which did not cleared the login cookie correctly
- Prevent websocket notifications during org import, this caused a lot of traffic, and slowed down the import.
  This is also the same as Bitwarden which does not trigger this refresh via websockets.

Rust:
- Updated to use v1.59
- Use the new `strip` option and enabled to strip `debuginfo`
- Enabled `lto` with `thin`
- Removed the strip RUN from the alpine armv7, this is now done automatically

src/mail.rs

@@ -30,7 +30,7 @@ fn mailer() -> SmtpTransport {
         .timeout(Some(Duration::from_secs(CONFIG.smtp_timeout())));
 
     // Determine security
-    let smtp_client = if CONFIG.smtp_ssl() || CONFIG.smtp_explicit_tls() {
+    let smtp_client = if CONFIG.smtp_security() != *"off" {
         let mut tls_parameters = TlsParameters::builder(host);
         if CONFIG.smtp_accept_invalid_hostnames() {
             tls_parameters = tls_parameters.dangerous_accept_invalid_hostnames(true);
@@ -40,7 +40,7 @@ fn mailer() -> SmtpTransport {
         }
         let tls_parameters = tls_parameters.build().unwrap();
 
-        if CONFIG.smtp_explicit_tls() {
+        if CONFIG.smtp_security() == *"force_tls" {
             smtp_client.tls(Tls::Wrapper(tls_parameters))
         } else {
             smtp_client.tls(Tls::Required(tls_parameters))