Switched to doctrine entities for user data.

Also fixed the following issues:
* $authPlugin->getDefaultGlobalRole is used when creating a new user
  from autologin
* Don't toggle display of deleted users but either include or exclude
  them. Active users are always shown.
Fixed syntax error.
Switched to doctrine entities for group data.
Switched to doctrine entities for global role data.
Fixed syntax error.
Fixed login.
Switched to doctrine entities for membership role data.
Switched to doctrine entities for customer data.

Fixed several errors in other areas as well.
Switched to doctrine entities for activity data.
Switched to doctrine entities for project data.
Switched to doctrine entities for project activities.

Fixed several issues from previous changes.
Fixed makeSelectBox function.
User class in $kga['user'].
Customer class in $kga['customer'].
Switched to doctrine entities for timesheet data.
Merge branch 'doctrine' of github.com:ServiusHack/kimai into doctrine