Better handling of "Unable to find MAC address" logging

[treydeal]

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Hi there! When I'm trying to use the Sunshine logs for troubleshooting or configuration, a pretty sizable chunk of the scroll bar ends up being a repeating line - "Warning: Unable to find MAC address for 192.168.1.2" (actual IP address substituted) - which shows up every 3 seconds or so if there is a client application open. My best guess as to why this log is displaying in the first place maybe has something to do with Tailscale being in play, but at least in the client setups I've tested there doesn't seem to be any negative impact of not being able to identify the MAC address. Is it possible to prevent this log spamming somehow? If there's nothing straightforward that can be done in the Sunshine configuration, I had a few ideas that may work as a possible solution, loosely in order of attractiveness:

• Only send that log once per IP address per Sunshine restart
• Change classification of log entry to Debug or Verbose
• Use logging logic that does something similar to a "Last log entry repeated X times" type of thing
• Have a checkbox or flag in a config file to disable that error check completely

If there's something simple that I'm missing here, definitely let me know - it would be much more enjoyable to look through the logs without feeling the need to paste them into a text editor and remove all the noise first!