This commit introduces support for Microsoft Authentication via the settings menu. There are a few known issues and TODOs which should not be hard to fix.
Once the auth flow from the settings screen is complete, the auth folow for first-time login (ie no accounts added yet) must be added. Should not be very difficult. The plan is to add one more view with two login buttons. The Mojang button will just bring you to the login page. The microsoft one will launch OAuth2.
