fix: guard retail-only InterfaceOptions/SpecializationUtil/AscensionSpellbookFrame; port icons to BLP

Clique/config/OptionsPanel.lua

@@ -17,7 +17,7 @@ local L = addon.L
 --- and it's been moved from AddonCore due to taint issues.
 -------------------------------------------------------------------------]] --
 
-local about = CreateFrame("Frame", addonName .. "AboutPanel", InterfaceOptionsFramePanelContainer)
+local about = CreateFrame("Frame", addonName .. "AboutPanel", InterfaceOptionsFramePanelContainer or UIParent)
 about.name = addonName
 about:Hide()
 
@@ -76,7 +76,7 @@ addon.optpanels = addon.optpanels or {}
 addon.optpanels.ABOUT = about
 
 about:SetScript("OnShow", about.OnShow)
-InterfaceOptions_AddCategory(addon.optpanels.ABOUT)
+if InterfaceOptions_AddCategory then InterfaceOptions_AddCategory(addon.optpanels.ABOUT) end
 
 --[[-------------------------------------------------------------------------
 --  End Dialog
@@ -551,4 +551,4 @@ panel.cancel = panel.refresh
 
 function addon:UpdateOptionsPanel() if panel:IsVisible() and panel.initialized then panel.refresh() end end
 
-InterfaceOptions_AddCategory(panel, addon.optpanels.ABOUT)
+if InterfaceOptions_AddCategory then InterfaceOptions_AddCategory(panel, addon.optpanels.ABOUT) end