Add optimized TokensWorth chat and loot modules

Add Block NPC Spam, World Chat Hider, and Loot Quality to Extras with shared chat filtering, event-driven loot quality handling, runtime safety fixes, and updated documentation/provenance.

mods/world-chat-hider.lua

@@ -0,0 +1,59 @@
+-- Adapted from TokensWorth/ShaguTweaks-mods (MIT, original copyright GryllsAddons).
+
+local T = ShaguTweaks.T
+local Filter = ShaguTweaks.ExtrasChatFilter
+
+local module = ShaguTweaks:register({
+  title = T["World Chat Hider"],
+  description = T["Hides World channel messages while inside an instance without leaving the channel."],
+  expansions = { ["vanilla"] = true, ["tbc"] = nil },
+  category = T["Chat"],
+  enabled = nil,
+})
+
+local function IsInsideInstance()
+  if type(IsInInstance) ~= "function" then return false end
+
+  local inside = IsInInstance()
+  return inside == 1 or inside == true
+end
+
+local function IsWorldChannel()
+  -- Vanilla 1.12 CHAT_MSG_CHANNEL exposes the base channel name in arg9.
+  -- Custom channel names are not localized, so comparing the actual event is
+  -- both cheaper and safer than querying GetChannelName("world") every time.
+  if arg9 and string.lower(arg9) == "world" then
+    return true
+  end
+
+  -- Conservative fallback for clients that omit arg9: arg4 is the numbered
+  -- channel label (for example "5. World").
+  if arg4 then
+    local full = string.lower(arg4)
+    if full == "world" then return true end
+
+    local _, _, base = string.find(full, "^%d+%.%s*(.+)$")
+    if base == "world" then return true end
+  end
+
+  return false
+end
+
+local function FilterWorldChat(event)
+  if event ~= "CHAT_MSG_CHANNEL" then return false end
+  if not IsInsideInstance() then return false end
+
+  return IsWorldChannel()
+end
+
+module.enable = function(self)
+  if Filter then
+    Filter:Register("WorldChatHider", FilterWorldChat)
+  end
+end
+
+module.disable = function(self)
+  if Filter then
+    Filter:Unregister("WorldChatHider")
+  end
+end