feat: allow setting misc.log_filters in config.toml (#552)

Allow setting `log_filters` in `config.toml`

This allows setting a list of `log_filters` in the `[misc]` section in
the `config.toml`. These filters are prepended to any filters listed
with `--log-filters`. Finally, `--verbose` can now be used with
`--log-filters`, and it will append `debug` to the list of filters
rather than replacing it entirely.

src/main.rs

@@ -64,8 +64,6 @@ fn run() -> Result<()> {
         return Ok(());
     }
 
-    install_tracing(&opt.tracing_filter_directives())?;
-
     for env in opt.env_variables() {
         let mut splitted = env.split('=');
         let var = splitted.next().unwrap();
@@ -84,6 +82,7 @@ fn run() -> Result<()> {
     }
 
     let config = Config::load(opt)?;
+    install_tracing(&config.tracing_filter_directives())?;
     set_title(config.set_title());
     display_time(config.display_time());
     set_desktop_notifications(config.notify_each_step());