KCDS 0.2.3.1 (work in progress)

A second work-in-progress build of milestone 0.2.3. The milestone stays open; its issues stay open until their live acceptance.

Servers need the 0.2.3.1 server as well. The launcher updates itself to 0.2.3.1 on the next start.

Fixes

Launcher updates no longer roll back when a file is held for a moment (for example by a virus scanner checking the new download): a busy file is tried again for a few seconds, and a file that stays locked is named in the launcher log.
NPCs fight like the game's own (#60). A server NPC now has its soul's own faction and social class, so a struck bandit or soldier fights back instead of running away, and keeps fighting.

The game's own interactions are off on a server until a resource allows them: the horse whistle key, "Talk" and the focus chat on NPCs, and talk on other players. Interactions.set(name, allowed) for everyone, player.setInteraction(name, allowed | null) for one player (horseWhistle, npcTalk, npcChat, playerTalk).
Horse whistle heard by others: a player's whistle plays on their body for everyone within 100 m in the same world, fading with the distance. player.whistle() makes a player whistle (their horse comes), and the event playerWhistle(player) tells resources.
NPC damage: npc.setCombatSkill({ damage }) scales an NPC's blows on players (0 to 10, null for the game's own damage); npc.fightsBack and Npc.create({ fightsBack }) choose whether a struck NPC attacks back.
crafting-kit resource (test servers): every player who joins knows all alchemy and smithing recipes and gets their materials; /kit [alchemy|smithing] gives more.
Containers' sort bar shows the server's item limit column on both sides (#262).

Milestone 0.2.3 is not closed. Still being worked on: an injured player's slower walk as others see it (#47) and a broken smithing workpiece seen live (#89).