PR-Build (eefc61d)

Changelog:
- quests can be hidden (#quest command now accepts up to 4 args)
- notification manager is now initialized by QSystem.lua
- fixed journal notes not displayed if there are no raised flags
- lowered delay after remove_zombies command in singleplayer
- fixed quest completion/failure notification not playing in singleplayer
- added Korean translation (thanks to teray)

PR-Build (99391e4)

Changelog:
- implemented call stack and added #ret command (used only in dialogue scripts)
- using is_alive command in _pos scripts is now allowed
- sound notification plays on task completion
- quest completion/failure sound is now queued just like quest unlock sound
- tweaked minimum width for choice buttons
- fixed quest panel not updating on event end

PR-Build (8c3f975)

Changelog:
- improved stability of notification queue

PR-Build (b0431d1)

Changelog:
- implemented notification queue
- added sound notifications for quest completion/failure and task unlock
- added an invalid argument exception handler to fade_in and fade_out commands
- calling fade_in or fade_out when dissolve is in its final state now works correctly

PR-Build (bf07f76)

PR-Build (aac7d9a)

PR-Build (3f7dd51)

Alpha-Build (66f15b0)

Alpha-Build (0d96849)