Implement sorting by rank achieved

[peppy]

[ticotaco72]

should be ranks fetched every time or saved/cached? if cached how long?

[frenzibyte]

should be ranks fetched every time or saved/cached? if cached how long?

probably saved to the database, wdym by how long? it should stay saved until a new rank is achieved

[ticotaco72]

how fast should cache expire, rank isn't constant

[peppy]

A first step would be importing the user's online score into the local database when importing or viewing the beatmap at song select.