Use fallback codec if first frame fails (#9242)

* Both encoding and decoding use fallback if first frame fails
* More aggresive max fail counter
* Update hwcodec, add judgement when length of the encoded data is zero, https://github.com/rustdesk/rustdesk-server-pro/discussions/382#discussioncomment-10525997
* Fix serde hwcodec config toml fails when the non-first vec![] is empty, https://github.com/toml-rs/toml-rs/issues/384, the config file is used for cache, when check process is not finished, the cache is used.
* Allow cm not start for pro user

Signed-off-by: 21pages <sunboeasy@gmail.com>

src/server/connection.rs

@@ -1670,9 +1670,11 @@ impl Connection {
                 .await
                 {
                     log::error!("ipc to connection manager exit: {}", err);
+                    // https://github.com/rustdesk/rustdesk-server-pro/discussions/382#discussioncomment-10525725, cm may start failed
                     #[cfg(windows)]
                     if !crate::platform::is_prelogin()
                         && !err.to_string().contains(crate::platform::EXPLORER_EXE)
+                        && !crate::hbbs_http::sync::is_pro()
                     {
                         allow_err!(tx_from_cm_clone.send(Data::CmErr(err.to_string())));
                     }