* Add a hide multiplayer replays checkbox
* Hide player number column ; add kart icon column
Enabling the icon display creates issues in the list widget layout, however.
* Fix formatting issue when an icon is displayed in only some cells
* Display "?" icon when kart model is unknown
This can happen with uninstalled addons, old replays with removed official karts, etc
* Add helper functions for icons in replay info dialog
* Add kart icons to replay info dialog
* Delete m_icon_bank in tearDown