Libraries: Get Deusty.Net/AsyncSocket from NuGet
Update libraries to newer versions

- JSON.NET (Newtonsoft.Json)
- MoreLinq
- System.Data.SQLite (add references to the Linq-library, even though we don't use it)
- MediaInfo
- MySql.Data
WebMP: Update MVC and jQuery packages
Configurator: Switch to ZXing.Net for QR-code generation

It's more modern, has a .NET-style API (instead of Java-style) and seems to be
faster.