Update ai actions tracing subsystem

Fix white background in players list on halloween, christmas and easter

Merge from default

Clear in-game flag when user joins room

libav name refactor

another stake at variable pre-initialisation - we lost preview logging in the course

apparently an older version was provided earlier and this one is newer and theoretically desync free. untested.

fix hat names. more efficient killing off of limited hogs (takes too long to wait otherwise)

new script specialising in altering weapon behaviour

merge from stable

polish language update (+ closes issue #322)

consistent line endings

consistent line endings

fix reserved hats from scripting

fix reserved hats from scripting

remove cleaver gradient

remove cleaver gradient

merge trunk in 0.9.18

dev version bump, for 'stable' commits please use 0.9.18 branch

disable this block since it doesn't fit star's new graphic. doesn't show up often anyway, since unc0rr changed gst clearing

use VideoItem::prefix instead of VideoItem::name as suggested by Stepan777

tweaked hedgehog sprite (gstLoser and such) this version tries to clean up a bit of the pixelation from having not been edited in inkscape

Change messages a bit

Mutant script