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Consistency in name and function.
fix: Renamed DataSource.kt to ListDataSource, because that's what it is. Also made it inherit from DataSource.
fix: Removed "shared" in the naming, because that might confuse these with using actual SharedPreferences.
fix: Renamed the member-functions from get/add/getAll/addAll to load/save/add, and made the behavior consistent between list- and single-.
fix: Simplified add().
fix: Better clear() - actually remove stuff, not just overwrite with empty string.
feat: Added Javadoc, even though the naming should be quite self-explanatory