Update: Error System

This is the second BIG update!
Separate app_info and session info.
Debug: 404 error in begin of navigation (controller not found).
Change and update data file functions to appear more OOP and more easy
to do call.
In page title don't use ucfirst, but ucwords.
Update: Account Login

Update the functions to correspond to data session functions (look last commit).
Debug: Login/Logout System

Bug: I remove a session!
Debug: Remove only user data...