Filter UNIT_AURA by unit token and drop the unit streams in realtime mode

Two handlers opened by testing arg1 against a fixed set of unit tokens, so
every other unit's copy of UNIT_AURA reached Lua only to be compared away
-- in a raid that is the bulk of them. ClassicAPI's RegisterUnitEvent
pushes that filter into the client, so the handler only runs for the units
named. Filtering is per (frame, event), so the other events sharing the
libdebuff frame are unaffected.

  Utility.lua      UNIT_AURA -> "target"            (libdebuff seeding)
  ComboPointTracker UNIT_AURA -> "target", "player"

Extensions register through CleveRoids.RegisterEvent, so ExtensionsManager
gains a RegisterUnitEvent alongside it.

Separately, the main frame's unit state streams (UNIT_AURA / UNIT_HEALTH /
UNIT_POWER, or the _GUID variants under Nampower v2.39+) are now registered
only in event-driven mode. Their handlers are wholly wrapped in
`realtime == 0`, so with realtime on every one of them crossed into Lua and
returned immediately while the OnUpdate did the refreshing. Registration is
applied at load, again at VARIABLES_LOADED once the saved setting is
readable, and whenever /cleveroid realtime flips it.

Those three stay plain RegisterEvent calls: their handlers ignore the unit
and refresh every macro, and a conditional may name any unit
([@party3,hp:<50], @focus, @mouseover), so narrowing the token set would
leave those icons stale. The _GUID variants could not be filtered anyway --
their first argument is a GUID, not a unit token.

Core.lua

@@ -591,6 +591,10 @@ frame:SetScript("OnEvent", function()
     if type(CleveRoidMacros.macrocheck) ~= "number" then
         CleveRoidMacros.macrocheck = 1  -- enabled by default
     end
+
+    -- The saved realtime setting is only readable now; the unit streams were
+    -- registered at load assuming event-driven mode.
+    CleveRoids.ApplyUnitStreamEvents()
 end)
 
 -- Queues a full update of all action bars.
@@ -4464,18 +4468,36 @@ if type(C_LossOfControl) == "table" then
     CleveRoids.Frame:RegisterEvent("LOSS_OF_CONTROL_ADDED")
     CleveRoids.Frame:RegisterEvent("LOSS_OF_CONTROL_UPDATE")
 end
--- Use GUID events when available (v2.39+), fall back to standard per-token events
+-- The unit state streams that drive icon refresh: GUID events when Nampower
+-- provides them (v2.39+, one event per unit change rather than one per token),
+-- else the stock per-token events. These cannot become RegisterUnitEvent calls
+-- -- the handlers ignore the unit and refresh every macro, because a conditional
+-- may name any unit ([@party3,hp:<50], @focus, @mouseover), so narrowing the
+-- token set would leave those icons stale.
+local unitStreamEvents
 if CleveRoids.NampowerAPI.features.hasUnitGuidEvents then
-    CleveRoids.Frame:RegisterEvent("UNIT_AURA_GUID")
-    CleveRoids.Frame:RegisterEvent("UNIT_HEALTH_GUID")
-    CleveRoids.Frame:RegisterEvent("UNIT_MANA_GUID")
-    CleveRoids.Frame:RegisterEvent("UNIT_RAGE_GUID")
-    CleveRoids.Frame:RegisterEvent("UNIT_ENERGY_GUID")
+    unitStreamEvents = { "UNIT_AURA_GUID", "UNIT_HEALTH_GUID", "UNIT_MANA_GUID", "UNIT_RAGE_GUID", "UNIT_ENERGY_GUID" }
 else
-    CleveRoids.Frame:RegisterEvent("UNIT_AURA")
-    CleveRoids.Frame:RegisterEvent("UNIT_HEALTH")
-    CleveRoids.Frame:RegisterEvent("UNIT_POWER")
+    unitStreamEvents = { "UNIT_AURA", "UNIT_HEALTH", "UNIT_POWER" }
 end
+
+-- They do fire continuously for every unit in range, and in realtime mode their
+-- handlers do nothing at all: the OnUpdate refreshes on every throttled tick and
+-- QueueActionUpdate no-ops. Rather than pay a Lua dispatch per event to return
+-- early, drop the registrations entirely while realtime is on. Re-applied at
+-- VARIABLES_LOADED (when the saved value is first known) and whenever
+-- `/cleveroid realtime` flips it.
+function CleveRoids.ApplyUnitStreamEvents()
+    local eventDriven = not CleveRoidMacros or CleveRoidMacros.realtime == 0
+    for i = 1, table.getn(unitStreamEvents) do
+        if eventDriven then
+            CleveRoids.Frame:RegisterEvent(unitStreamEvents[i])
+        else
+            CleveRoids.Frame:UnregisterEvent(unitStreamEvents[i])
+        end
+    end
+end
+CleveRoids.ApplyUnitStreamEvents()
 if CleveRoids.hasSuperwow then
   CleveRoids.Frame:RegisterEvent("UNIT_CASTEVENT")
 end
@@ -5808,6 +5830,8 @@ SlashCmdList["CLEVEROID"] = function(msg)
         local num = tonumber(val)
         if num == 0 or num == 1 then
             CleveRoidMacros.realtime = num
+            -- The unit streams are only worth receiving in event-driven mode.
+            CleveRoids.ApplyUnitStreamEvents()
             CleveRoids.Print("realtime set to " .. num)
         else
             CleveRoids.Print("Usage: /cleveroid realtime 0 or 1 - Force realtime updates rather than event based updates (Default: 0. 1 = on, increases CPU load.)")