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.

Moved room name edit box from footer to top of page. Also shows room name when in slave mode. Temporarily increased HWForm's min height from 580 to 610.

Start piano higher (piano on maps that matched land_height was really weird before). Experiment w/ trying to make birdy shrink into distance to avoid odd birdy vanishes if tracking it.

restore former cluster behaviour (makes the most diff for the bomb)

lupdate -pro project_files/hedgewars.pro -no-obsolete yes, I think the lupdate commits should be separate and should contain the -no-obsole flag