Restructure samples folder

[xPaw]

Came up with this, maybe there's a better way to split them up.

000_Authentication
001_AuthenticationWithQrCode
002_WebCookie
003_ServerList
004_LegacyLogin (5.SteamGuard, keep this around while it works, delete 1.Logon)

010_Extending
011_DebugLog
012_AsyncJobs
013_UnifiedMessages

020_Friends
021_WebAPI
022_DotaMatchRequest

One troublesome thing about samples is that they all have logon in them. Perhaps samples should be restructured into a single project, where each sample is its own class instead, so that we can do basic auth for them all at once?