- 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/Modules/Permissions/CmdCdsCommands.cs

@@ -10,6 +10,7 @@ using System.Threading.Tasks;
 using NadekoBot.Common.Attributes;
 using NadekoBot.Common.Collections;
 using NadekoBot.Common.TypeReaders;
+using NadekoBot.Db;
 using NadekoBot.Modules.Administration;
 using NadekoBot.Modules.Permissions.Services;