## Summary
Removes FCM and related SDKs in favor of using the server introduced in #2024.
## Any other notes
This will require testing. It may be worth reverting this PR to introduce a toggle if this lasts more than 1 beta cycle.
Future work includes figuring out the permanent location for these services; they are on fly.io right now but that may cost money, but for now I just want TestFlight builds to use it.
Adds new fastlane lanes:
- `fastlane lint` which checks the linters
- `fastlane autocorrect` which applies the linters which can autocorrect (Rubocop, SwiftFormat)
Adds a build step to the Codegen abstract target which runs SwiftFormat in lint mode, pointing out what it's going to change when run.
Applies SwiftFormat to nearly all code -- exempts a few externally-sourced files and generated code.
- Combines all .entitlements into either: App-iOS, App-catalyst, WatchApp, Extension-iOS or Extension-catalyst.
- Cleans up and renames all the schemes to match target names
- Moves around several folders and deletes some old files.
- Converts Podfile to be hierarchical, rather than calling shared methods.
- Always runs MaterialDesignIcons script; aborts early if it's up-to-date.
- Updates all dependencies.
