Merge remote-tracking branch 'upstream/master' into js/modalDialog
Enabled disclaimer for logged in users

See
http://beta.woltlab.com/index.php/Thread/1191-Nutzungsbestimmungen-Disclaimer/
Merge branch 'js/modalDialog'
Merge branch 'master' of github.com:WoltLab/WCF
Merge branch 'master' of github.com:WoltLab/WCF
Merge branch 'master' of github.com:WoltLab/WCF
Merge branch 'master' of github.com:WoltLab/WCF
Shows an inline spinner when searching
Update UserBulkProcessingForm.class.php

access for eventlistener
Improved categoryAdd template
Added FileReader class
Fixes table styling in CKEditor div mode
Adds missing JavaScript code to delete user ranks
Fixes issue in UserActivityPointHandler::fireEvents()
Handling undocumented return value of a boolean false
Fixed issues with broken stat cache
Added missing language variable
Merge branch 'master' of github.com:WoltLab/WCF
Ignore potential collisions if importing follower

Under certain circumstances, the default inserts could fail if a user is being merged during the process and follows the same user as the merged user.
Fixes issue with unchecked checkboxes during package installation

If one checkbox is unchecked, no further input element is evaluated since `return false;` is executed which terminates the iteration instead of (as intended) continuing the iteration with the next input element.