- 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/Utility/Services/VerboseErrorsService.cs

@@ -6,6 +6,7 @@ using NadekoBot.Common.Collections;
 using NadekoBot.Extensions;
 using NadekoBot.Modules.Help.Services;
 using NadekoBot.Core.Services;
+using NadekoBot.Db;
 using NadekoBot.Modules.Administration;
 
 namespace NadekoBot.Modules.Utility.Services