Consolidate application logging
Right now logging statements produced by the app have different tags, which makes it tedious to screen for logs.
Some tags that are in use:
- "nkwhale.ffa.de" (part of the application id, which is probably longer than the max length a tag can have)
- "FFA": Defined by a custom extension function extension in Util.kt
- "OAuth": Defined by the OAuth class
We should consolidate that so we can capture all logs more easily.