Action bars: route events to narrow passes, drop the OnUpdate

The pfActionBar frame ran an OnUpdate every frame and fully rebuilt all 140
buttons on events that only touch one part of them.

- Events go where the stock 1.12 bars send them: page and bonus-bar changes
  to the main bar's pager only, UPDATE_BINDINGS to the keybind text only,
  combat, auto repeat and tradeskill events to the active-border pass, and
  aura/form changes to the stance buttons that exist. Full rebuilds are left
  for entering the world, slot changes and the drag grid.
- Keybind text is read once per binding change from a fixed per-button
  command, no longer formatted and gsub'd on every slot update.
- Updates flush on the next frame through RunNextFrame instead of a 40 Hz
  OnUpdate; range is polled on a C_Timer ticker only while glowrange is on.
- Passes check visibility once per bar and walk only its shown buttons; a bar
  refreshes its buttons from OnShow, replacing the polled stale catch-up.
  Range no longer checks the buttons of disabled bars.
- Cooldowns skip CooldownFrame_SetTimer when start/duration/enable are
  unchanged; the active border only touches widgets when its state changes,
  and the "statechange" animation now follows every state change.
- PET_BAR_UPDATE only shows or hides the pet bar instead of re-running its
  whole layout; unlock mode is hooked instead of polled.
- Stance and pet buttons no longer inherit the previous button's oom tint.

pfUI.bars.update is replaced by pfUI.bars.QueueSlot(slot).

modules/thirdparty-vanilla.lua

@@ -899,7 +899,7 @@ pfUI:RegisterModule("thirdparty-vanilla", function()
 
     -- trigger the event whenever SuperMacro got an update
     hooksecurefunc("SM_UpdateActionSpell", function()
-      for slot=1,120 do pfUI.bars.update[slot] = true end
+      for slot=1,120 do pfUI.bars.QueueSlot(slot) end
     end)
   end)