[Feature]: "auto" region

[sprunk]

Describe the Feature

Alternative take at handling the problem from #356. Instead of picking a specific region (EU etc) there could be an "auto" option that picks a region dynamically at each game start.

Expected Behavior

Exact behaviour unspecified, the algorithm may well be a black box as long as it makes decent choices.

Some example trivial algos:

• assign each country into a region and just pick whichever the majority of players are from.
• whatever region the current boss is from.
• split the day into three 8h parts and rotate between US, EU and asia/australia following each region's prime game time.
• some super fancy data analysis approach.

You could even mix those rules (e.g. boss takes precedence, but another rule if no boss).

Extra features:

• you can automatically direct people to an optimal "second choice" server if one is overloaded or undergoing maintenance.
• you can have special rules for events/tourneys/etc

If the algo turns out to be good enough then you could stop offering a manual choice (UI simplification, UX improvement).