Use spawn() instead of block_on() again because it reportedly might lead to deadlocks

Also, fix some minor stuff

src/config.rs

@@ -337,7 +337,7 @@ impl Context {
                         message::delete_msgs(self, &[MsgId::new(webxdc_message_id)]).await?;
                     }
                     self.sql.set_raw_config(key, value).await?;
-                    self.debug_logging.store(0, atomic::Ordering::Release);
+                    self.debug_logging.store(0, atomic::Ordering::Relaxed);
                 } else {
                     let data: &[u8] = include_bytes!("../assets/webxdc_logging.xdc");
 
@@ -352,7 +352,7 @@ impl Context {
                         .set_raw_config(key, Some(&msg_id.to_u32().to_string()))
                         .await?;
                     self.debug_logging
-                        .store(msg_id.to_u32(), atomic::Ordering::Release);
+                        .store(msg_id.to_u32(), atomic::Ordering::Relaxed);
                 }
             }
             _ => {

src/context.rs

@@ -442,15 +442,22 @@ impl Context {
             typ: event.clone(),
         });
 
-        let context = self.clone();
-        let debug_logging = context.debug_logging.load(atomic::Ordering::Acquire);
+        // `task::spawn()` below is a bit slow, so make sure to only call it if
+        // debug logging is enabled; that's why we have the Context::debug_logging
+        // property. Using `spawn()` also has the disadvantage that the logs might
+        // get out of order.
+        // Both could be solved by using `task::block_on()` instead, but reportedly,
+        // this could lead to deadlocks. A better solution would be to make
+        // `emit_event()` async.
+        let debug_logging = self.debug_logging.load(atomic::Ordering::Relaxed);
         if debug_logging > 0 {
             let time = SystemTime::now()
                 .duration_since(SystemTime::UNIX_EPOCH)
                 .unwrap_or_default()
                 .as_millis() as i64;
 
-            async_std::task::block_on(async move {
+            let context = self.clone();
+            async_std::task::spawn(async move {
                 let webxdc_instance_id = MsgId::new(debug_logging as u32);
 
                 match context

src/message.rs

@@ -1288,7 +1288,7 @@ pub async fn delete_msgs(context: &Context, msg_ids: &[MsgId]) -> Result<()> {
                 .sql
                 .set_raw_config(Config::DebugLogging, Some("0"))
                 .await?;
-            context.debug_logging.store(0, atomic::Ordering::Release);
+            context.debug_logging.store(0, atomic::Ordering::Relaxed);
         }
     }
 

src/sql.rs

@@ -346,7 +346,7 @@ impl Sql {
             let debug_logging = self.get_raw_config_u32(Config::DebugLogging).await?;
             context
                 .debug_logging
-                .store(debug_logging.unwrap_or(0), atomic::Ordering::Release);
+                .store(debug_logging.unwrap_or(0), atomic::Ordering::Relaxed);
 
             Ok(())
         }