Migrate all server-related things from Firebase to Azure

[lazerwalker]

• [x] Rewrite functions to use Azure Functions, deploy to Azure, test they work
• [x] Remove references to Firebase in the main codebase, and update URLs
• [x] Confirm access controls mean the seed JSON files are publicly-downloadable
• [x] Stop the new functions from blowing up the non-function compilation pipeline with tsc errors
• [x] Manually test updateAttire function
• [x] Manually test openConsumableEgg function
• [x] Figure out how to give Orta access to the Azure resource groups
• [x] Port server tests over
• [x] Confirm that the migration script properly works
• [x] Do a one-time migration of JSON data for the hourly seed downloads
• [x] When https://github.com/PlayFab/NodeSDK/issues/105 is fixed, remove npm / git submodule hack from functions dir
• [x] Fix Azure Function CLI deploy to deploy functions AND migration task
• [x] Add Azure Function deploy command to top-level package.json
• [x] Set up Azure static site hosting for both staging and prod
• [x] Remove all traces of Firebase from codebase
• [ ] Figure out why iOS app has a white border around the game when pointed at the Azure-hosted version
• [ ] Figure out why Azure static site hosting requires me to go to flappyroyale.io/prod/index.html instead of flappyroyale.io/prod/ (which is important, since the former would require us to push out new builds of the native apps via the App Store / Play Store)
• [ ] Build and manually test Android app
• [ ] Test Azure CDN right after a deploy to make sure our cache-busting strategies are working
• [ ] Move DNS records for both staging and prod
• [ ] Merge everything into master
• [ ] Maybe: download all firehose bucket data from Firebase, potentially upload to Azure firehose bucket

[lazerwalker]

I re-wired up the getItemFromLootBox tests, but the processNewRecording test file was previously already nonfunctioning (we refactored out the entire file it was trying to test). Might be worth trying to get those tests functioning again some day; that day is not today.

[lazerwalker]

FWIW, I'm leaving the Firebase SDK in the native apps for now. It's needed on Android for push notifications (and maybe some other stuff? It's deeply tied up in first-party Google services), and the only thing we're doing in native iOS land is analytics, which we might as well leave in place rather than build out an Azure thing.