Core: move Utils to folder module

[beauxq]

What is this fixing or adding?

maybe let us organize code better, and stop this file from growing as much

How was this tested?

generated, served, and played a game

[black-sliver]

I'm wondering if this is really the best solution.

What I suggested on Discord a while back is creating a lower case folder (that'd have to be called util, or archipelago/util or archipelago/utils, not utils).
And then change the old Utils.py to import and export all old functionality from the new lower case util module.

[beauxq]

My inclination is that the best time to switch to lower case is at the same time as making an installable package, rather than the churn of people migrating their import statements twice.