Publish resolved macro actions to ClassicAPI's C_Macro.SetMacroDisplay

Hands ClassicAPI the action this addon resolved for each macro, so the icon,
tooltip, cooldown sweep, range and usable state come from the client instead of
from replaced action-bar globals. That also reaches the drag cursor and the macro
window grid, which Lua cannot touch, and lets the client answer range for a macro
slot directly rather than borrowing a proxy slot.

- CleveRoids.useClassicAPIDisplay feature-detects C_Macro.SetMacroDisplay rather
  than checking CLASSIC_API_VERSION, which reports a dev sentinel while the API is
  unreleased. ClassicAPIMacroDisplay tells ClassicAPI we drive macro display, which
  it otherwise stands down from when it sees this addon.
- macro.actions.macroID back-references the Blizzard index, since the update loop
  walks actions objects rather than macros. nil for SuperMacro macros, which have
  no index and so cannot be published.
- PublishDisplay sends false, not nothing, when no action matched: that claims the
  macro and shows the question mark, where silence would hand it back to
  ClassicAPI's own #showtooltip parser.
- PublishAllDisplays runs once the addon is ready and after every re-parse, since
  ClassicAPI re-evaluates nothing for us. It covers macros that aren't on a bar,
  which is what keeps the macro window grid correct. Deferred past load because
  SetMacroDisplay returns false until the player is in the world.
- ReleaseDisplays hands every macro back on DisableAddon.

The per-slot ACTIONBAR_SLOT_CHANGED fan-out is kept for the non-integrated path.
Publishing repaints every slot holding the macro through the client's own notifier,
so it is redundant when the API is present, but removing it outright would leave
buttons never repainting on a ClassicAPI build without the API.

Init.lua

@@ -24,6 +24,20 @@ CleveRoids.hasSuperwow = SetAutoloot and true or false
 CleveRoids.hasTurtle   = (type(_G.TURTLE_WOW_VERSION) ~= "nil")
 CleveRoids.supported   = CleveRoids.hasTurtle
 
+-- ClassicAPI macro display (C_Macro.SetMacroDisplay): hand ClassicAPI the resolved
+-- action per macro instead of replacing the action-bar globals in Lua, so the icon,
+-- tooltip, cooldown sweep, range and usable state all come from the client -- including
+-- the drag cursor and the macro window grid, which Lua cannot reach.
+--
+-- Feature-detect rather than version-check: the API is unreleased, so
+-- CLASSIC_API_VERSION reports the dev sentinel. ClassicAPI stands down from macro
+-- display entirely when it sees this addon loaded; ClassicAPIMacroDisplay is what
+-- tells it we drive it instead. A fork that leaves the flag unset keeps the old
+-- behavior -- both must never drive the same buttons.
+CleveRoids.useClassicAPIDisplay =
+    (type(C_Macro) == "table" and C_Macro.SetMacroDisplay ~= nil) and true or false
+CleveRoids.ClassicAPIMacroDisplay = CleveRoids.useClassicAPIDisplay
+
 CleveRoids.ParsedMsg = {}
 CleveRoids.Items     = {}
 CleveRoids.Spells    = {}