Avoid using allprojects and subprojects

[simolus3]

This avoids the use of allprojects and subprojects for regular builds, which seems to be recommended ("you should use convention plugins or the proper APIs whenever possible"):

• We had a top-level allprojects block setting up repositories that were already set up in settings.gradle.kts.
• Some dependencies related to an intellij download were explicitly excluded. I assume this is a left-over from when we had our own SQLDelight plugin, I've removed the entire repository and nothing seemed to break.
• Keeper, which we use to write on-device integration tests for Android, doesn't seem to work with the dependencyResolutionManagement block. Keeper is kind of unmaintained anyway, so this removes it by:
  • moving test logic from androidTest to main, and adding proguard rules ensuring the test utility does not get removed.
  • adding a few more proguard rules ensuring the test runner is also kept around.

Removing these brings us closer to enabling isolated projects in the future, which should speed up IDE sync.

[stevensJourney]

Nice!