Update structure of `PlayerDTO`, `PlayerRanksDTO`, and `PlayerInfoDTO`

[myssto]

These three DTOs are incredibly similar and their different usages are a bit confusing because of that. I believe they can be safely condensed into 2 DTOs for clarity. New structures should look like so:

PlayerInfoDTO

• Id
• OsuId
• Username
• Country

PlayerDTO : PlayerInfoDTO

• RankStandard
• RankTaiko
• RankCatch
• RankMania
• EarliestStandardGlobalRank (renamed from EarliestOsuGlobalRank)
• EarliestStandardGlobalRankDate (renamed from EarliestOsuGlobalRankDate)
• EarliestTaikoGlobalRank
• EarliestTaikoGlobalRankDate
• EarliestCatchGlobalRank
• EarliestCatchGlobalRankDate
• EarliestManiaGlobalRank
• EarliestManiaGlobalRankDate

Tasks:

• [ ] Remove existing PlayerDTO
• [ ] Rename existing PlayerInfoDTO to PlayerDTO
• [ ] Refactor the DTO structures to match above
• [ ] Return new PlayerDTO anywhere the old PlayerRanksDTO was used
• [ ] Add XML documentation to the new PlayerDTO