UseAction hooks: GetActionInfo + GetMacroSpell, drop tooltip scans

The three UseAction hooks in libtotem / libpredict / libcast all did
the same dance: filter out macros via GetActionText, then tooltip-scan
the action to recover the spell name + rank. ClassicAPI's
GetActionInfo + GetMacroSpell make both steps unnecessary:

- GetActionInfo returns ("spell", spellID) or ("macro", macroSlot)
- GetMacroSpell resolves a macroSlot to (name, rank, spellID) at the
  highest known rank, parsed engine-side at macro save time

So macros are no longer skipped — they resolve to their cast spell
just like a raw spell action. libtotem queue gains a real spellID
(the previous "no spellId available, icon-based fallback" comment is
obsolete). libcast also wins: it can feed the resolved spellID
through FindSpellBookSlotByID + libspell.GetSpellInfo(slot, "spell")
without the name-with-rank-suffix string concat round-trip.

Drops libtipscan:GetScanner("prediction") usage in libtotem and
libpredict, and libtipscan:GetScanner("libcast") in libcast.

libs/libpredict.lua

@@ -1074,12 +1074,16 @@ hooksecurefunc("CastSpellByName", function(effect, target)
   end
 end)
 
-local scanner = libtipscan:GetScanner("prediction")
 hooksecurefunc("UseAction", function(slot, target, selfcast)
   if not libpredict.sender.enabled then return end
-  if GetActionText(slot) or not IsCurrentAction(slot) then return end
-  scanner:SetAction(slot)
-  local effect, rank = scanner:Line(1)
+  if not IsCurrentAction(slot) then return end
+  local kind, id = GetActionInfo(slot)
+  local effect, rank
+  if kind == "spell" then
+    effect, rank = GetSpellInfo(id)
+  elseif kind == "macro" then
+    effect, rank = GetMacroSpell(id)
+  end
   if not effect then return end
   spell_queue[1] = effect
   spell_queue[2] = effect.. ( rank or "" )