[db] Support duplicate charts in song database #463
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This change fixes issues that happen when you have multiple charts with the same hash in the database. To do this we now keep a list of duplicates (if there are any) for a given hash. Then when we add scores, we can add them to all duplicates rather than just the one found in chartsByHash.
We also need to pass an initialized map database into ScoreScreen so we can update duplicates as well.
Since this is refactoring some score saving code, wanted to sanity check it