cooldowns survive a relog, the MOTD prints, and lost channels come back

- a cooldown still running when you log out and back in keeps sweeping instead of vanishing, and another character no longer inherits the previous session's cooldowns (2116)
- the server's Welcome and Patch 1.12 lines print at login in system yellow, and a character whose General, Trade and LocalDefense had gone silent for good gets them back at the next login (2119, 2120)
- the stock Interface Options window loads hidden beside ours, so pfUI's options skin finds the real thing; the Auto-join Guild Recruitment Channel row has a real store, and a /reload no longer trips on its camera dropdowns (2115)
- the combat log words a power gain on the display scale, so MikScrollingBattleText shows +1 Rage where it showed +10; a 1.12 predicate answers 1 or nil rather than a Lua boolean, the test ColorPickerPlus makes (2117, 2118)
- a Lua error quotes a program element with a backquote the way 5.0 does, so AceLibrary's argument checks report their caller instead of raising inside the error path (2122)

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

third_party/lua-src/lua-5.1.5/luaconf.h

@@ -200,7 +200,24 @@
 @@ LUA_QL describes how error messages quote program elements.
 ** CHANGE it if you want a different appearance.
 */
-#define LUA_QL(x)	"'" x "'"
+/*
+** BENILLA (decision 2122): 1.12's Lua is 5.0, which quotes every program element in an error
+** message with a BACKQUOTE and an apostrophe. 5.1 introduced this macro and made it two
+** apostrophes. Read out of WoW.exe's own .rdata, which carries all five of the formats this macro
+** feeds, in the 5.0 spelling:
+**
+**   bad argument #%d to `%s' (%s)          lauxlib.c luaL_argerror
+**   calling `%s' on bad self (%s)          lauxlib.c luaL_argerror's method arm
+**   attempt to %s %s `%s' (a %s value)     ldebug.c  luaG_typeerror
+**   %s:%d: %s near `%s'                    llex.c    luaX_lexerror (the client's own 0x87217c)
+**    in function `%s'                      ldblib.c  the traceback line debugstack renders
+**
+** The last one is not cosmetic: 80+ corpus addons ship AceLibrary, whose argCheck reads its own
+** caller back out of `debugstack()` with the pattern "`argCheck'.-([`<].-['>])", a pattern
+** cannot match 5.1's quoting, so the nil it gets is then passed to a %s and raises inside the
+** error path.
+*/
+#define LUA_QL(x)	"`" x "'"
 #define LUA_QS		LUA_QL("%s")