[chore] Update to latest Android targetSdkVersion

[CryptoGrampy]

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I'm not super familiar with the Android ecosystem, but it looks like the targetSdkVersion in build.gradle needs to get updated to the latest version, and there need to be a fair amount of changes/refactorings/library updates that will need to happen at this time.

I attempted to let Android Studio apply the suggested refactorings and it busted the app (something in Launcher.java probably busted and may need to be reworked).

[CryptoGrampy]

Relevant (see Launcher.java) https://stackoverflow.com/a/68001538