Add warning and reset flow for non-default masterserver address

For the sake of every brave warrior in #tech-support, watching people blindly flail at their keyboards and fail to port forward.

This adds a prompt to reset masterserver whenever a player attempts to host a netgame or load the in-game Server Browser with a non-default masterserver. If the player mashes through it, the default behavior is to reset, because nobody reads anything and I honestly cannot blame them at all.

Compiled it, it works and the intent is clear.

But given this is also for futureproofing, maybe an extra cvar to disable the nagging would be good too.

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• 8548d441 - Futureproofing mserv address conveyance

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• 1441fda8 - Clearly mark MS reminder + formatting touchup

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Added masterserver_nagattempts, default 5. Reduces by 1 when you dismiss the "wrong address" nag, once per boot. At 0, nags are disabled. Savvy players can disable the nags right away, but a future player on a community Master Server would eventually stop being harassed even without knowing about this.

To cover for someone somehow dismissing this without reading it 5 times (????), and for better general conveyance, the Server Browser address is now displayed when setting up a netgame with advertise On, or when viewing the in-game Server Browser. It's transparent and uses your highlight color when default, but uses the warning color and full opacity if it's changed.

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• 129fc2bb - Style cleanup

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resolved all threads

merged

mentioned in commit 34fd13be