Changed database update file
Helper and Booru update
Implemented CookieManager
Implemented BooruUser
Update
Merge branch 'devel' of https://github.com/teamalpha5441/SQLBooru into devel

Conflicts:
	SQLBooru/Resources/database_update_2_3.sql
	SQLBooruServer/AdminPanel.cs
	SQLBooruServer/CookieManager.cs