[x] Infoboard message "Zemke has voided the game UserA 3–1 UserB"
[x] Update standings if a group game
[x] In case of playoffs games the game will be removed from the tree but also still be available via the “Games” tab. The advancing of the voided game’s winner would be rolled back as the game has to be repeated. Conclusively it’s possible to void playoff games where the following game has already been played.