Add Class Resources and Debuff Highlighting modules; migrate settings to AceDB profiles

Move CoA settings from E.global/E.private into a proper AceDB-3.0 database
(CoA.db, SavedVariables ElvUI_CoADB) with a Profiles options tab, since
ElvUI doesn't ship AceDBOptions-3.0 (vendored under Libraries/).

Add ClassResources.lua: hooks the custom-class resource frames (segment
bar, orb, bar, multi-cast bar) into ElvUI's Toggle Anchors, with a
per-frame hide checkbox in a new "Class Resources" options tab.

Add DispelHighlight.lua: highlights dispellable debuffs on unitframes,
with talent-aware filtering for custom classes.

Fix mover/anchor reliability for Class Resources and the Instance
(LayerPicker) button:
- Movers were only retried until the target frame existed, not until the
  mover was actually created, so frames that start at zero size (e.g. a
  resource bar before that resource is ever active) permanently lost
  their mover.
- Class resource frames re-anchor themselves on refresh, stomping the
  mover's anchor; hook SetPoint to snap back to the mover holder whenever
  something else repositions the frame.
- Native click-drag on these frames ends with the engine calling SetPoint
  directly, severing the mover anchor entirely. Permanently block drag
  (script and RegisterForDrag) instead of clearing it once.

Modules/ExtraActionBar.lua

@@ -44,7 +44,7 @@ end
 local function UpdateSize(button)
 	button = button or _G[BUTTON_NAME]
 	if button then
-		local size = E.global.CoA.extraActionButtonSize or 52
+		local size = CoA.db.profile.extraActionButtonSize or 52
 		button:SetSize(size, size)
 		UpdateRimEdge(button, size)
 		UpdateHotkeyPosition(button, size)
@@ -124,7 +124,7 @@ local function SkinButton(button, container)
 		rim:SetAllPoints(icon)
 		rim:SetFrameLevel(button.backdrop:GetFrameLevel() + 10)
 		button.CoARim = rim
-		UpdateRimEdge(button, E.global.CoA.extraActionButtonSize or 52)
+		UpdateRimEdge(button, CoA.db.profile.extraActionButtonSize or 52)
 
 		button:SetFrameLevel(rim:GetFrameLevel() + 1)
 	end
@@ -158,13 +158,13 @@ local function SkinButton(button, container)
 end
 
 local function SetupMover(container, button)
-	if CoA.extraActionBarMoverCreated then return end
+	if CoA.extraActionBarMoverCreated then return true end
 
 	local width, height = button:GetSize()
-	if width == 0 or height == 0 then return end
+	if width == 0 or height == 0 then return false end
 
 	local left, bottom = button:GetLeft(), button:GetBottom()
-	if not left or not bottom then return end
+	if not left or not bottom then return false end
 
 	CoA.extraActionBarMoverCreated = true
 
@@ -191,6 +191,8 @@ local function SetupMover(container, button)
 	else
 		Anchor()
 	end
+
+	return true
 end
 
 local function TryHook()
@@ -198,11 +200,11 @@ local function TryHook()
 	local button = _G[BUTTON_NAME]
 
 	if container and button then
-		SetupMover(container, button)
 		SkinButton(button, container)
+		return SetupMover(container, button)
 	end
 
-	return container ~= nil and button ~= nil
+	return false
 end
 
 function CoA:InitializeExtraActionBar()