Log `thread_bus` IPC messages only in debug mode (#1800)

* zellij: Add global `DEBUG_MODE` variable

that tells us whether zellij was started with the `--debug` CLI flag.

* utils/errors: Only log thread_bus message in debug

mode, and discard the message otherwise.

* utils/logging: Increase logsize to 16 MiB

per logfile, totaling 32 MiB of logs at most (in two files).

* zellij: Set global `DEBUG` variable in server

thread and make sure the value of the `--debug` CLI flag is propagated
to the server, too.

This means that to enable debug mode, the server must be started with
the `--debug` flag. This happens when the first client that starts the
zellij session has the `--debug` flag set, because it will be forwarded
to the server. Subsequent clients attaching to the same session with the
`--debug` flag specified **do not** override the value of the `DEBUG`
variable. Hence, if the server wasn't started in debug mode, this cannot
be changed.

1 files changed, 1 insertions, 1 deletions

diff --git a/src/main.rs b/src/main.rs
index 895bc899..fa18f090 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -74,7 +74,7 @@ fn main() {
     {
         commands::kill_session(target_session);
     } else if let Some(path) = opts.server {
-        commands::start_server(path);
+        commands::start_server(path, opts.debug);
     } else {
         commands::start_client(opts);
     }