In-game server browser hangs/crashes the game if no response from server

[mohaa-man]

Describe the bug
The in-game server browser hangs the game if there is no response within a few seconds.

To Reproduce
Steps to reproduce the behavior:

1. Ensure game server list server is unreachable (e.g. create a bad local DNS entry, or block the IP in your firewall or router, etc.)
2. Go to the in-game server browser (Multiplayer->Join Game->Join Internet Game->Browse Internet Servers)
3. Game will hang; after a few seconds OS may prompt you to force quit

Expected behavior
The original game had this same bug/problem; it seems the server polling should be asynchronous from the GUI but it isn't. If there is no response, the server list should just appear empty, or perhaps indicate a no response, but allow you to navigate away.

Version information (please complete the following information):

• OS: arch linux x86_64
• OS Version: latest (rolling release), kernel 6.10.10-arch1-1
• OpenMoHAA Version: 0.70.0-alpha+20.0a90757 (Sep 2 2024)

Additional context (OPTIONAL)
In-game list server is occasionally down or slow, so this problem occurs on its own from time to time (not just artificially).