- Database namespace is now NadekoBot.Db

- Db related code is now in src/NadekoBot/Db
- Finished major part of the db refactor, but many optimizations are left to be made

src/NadekoBot/Common/TypeReaders/ShmartNumberTypeReader.cs

@@ -5,6 +5,7 @@ using NadekoBot.Core.Services;
 using System;
 using System.Text.RegularExpressions;
 using System.Threading.Tasks;
+using NadekoBot.Db;
 using NadekoBot.Modules.Gambling.Services;
 
 namespace NadekoBot.Core.Common.TypeReaders