v0.4

Changelog:

• Log-Level of events has been altered so that running the server using the WARN-level provides all important information but does not clutter the journal.
• 4Do3Di3AiDriver: Remove bogus output in #25
• Webinterface improvements: The web-interface now contains a header with information about the LXA IOBus server in #23
• driver/EthernetMux: Use product ID printed on the device in #26
• systemd/contrib: Update systemd-units in #24
• can rx/tx: Handle bus errors or shutdown service in #27
• server: add compatibilty with aiohttp 3.8 in #29
• Show LSS state and CAN TX error on status page in #28