Make number of hedgehogs restriction actually work in network game

Removed constant repainting of bgwidget on every frame.

Prepends an asterisk on maps, styles, and themes that are DLC. (Resolves issue #515)

Force-starting a game now only works for client versions >43

Learn to properly localize strings with numbers pleeeeaaaase

It is now possible to start a game even if not all players are "ready"; a confirmation prompt is shown. This commit updates the server. Unless the official server is updated, this commit will do nothing new.