Recoded some parts of the server
Made SQLWrapper public accessible
Implemented BooruUserManager

Also moved BooruUser into BooruUserManager
Overloaded GetUser method for use with CookieCollection
Renamed WebServer to BooruServer + Update
Recoded Context class

Most members are only initialized if they are needed (Init on first
usage)
Implemented new VFSAdminPanel
Updated ServerHelper
Update
Deleted VFSSecureDelegateFile
Updated VFSLoginFile (new user management)
Implemented image resize on double click
Updated Program class