Add option to delete player on 'match player management' page.
Allow to choose only not yet added users when displaying 'add player'
form on 'match players management' page.
Add option to publish created match.
Change package for 'add match' functionality. Move to 'campaign'
sub-package.
Extract generic controllers from 'campaign match' controller to 'match'
controller.
Fix not working validation when adding new campaign match.
Rename campaign specific classes to fit new match types separation.
Add form for creating versus match.
Add unit tests for campaign match validator.
Extract common match fields to base validation class.