Resolve item sets via ClassicAPI; drop Reliquary dependency

Item-set membership and set info now read ItemSet.dbc directly through
ClassicAPI instead of the nampower/Reliquary glue, so set features no
longer require the Reliquary DLL to be installed.

- ClassicAPI.lua: add GetItemSetIDByID and GetItemSetInfo wrappers.
- Utility.lua: repoint ResolveSetItems, CountEquippedSetItemsBySetId,
  GetEquippedItemSetInfo, and GetEquippedSetPieceCount at the ClassicAPI
  accessors. Set-name matching now uses the DBC name (localized; identical
  to the old enUS path on English clients).
- NampowerAPI.lua: remove the now-unused GetItemSet/GetItemSetId/
  GetItemSetItems/GetItemSetBonuses, the dead GetSpellEffectRadius (no
  callers, only radius source was Reliquary), and the orphaned RQ_SafeCall.
- Init.lua: drop hasReliquary detection and its startup feature line.
- Conditionals.lua: update the [set:] comment (no longer Reliquary-gated).

Init.lua

@@ -22,7 +22,6 @@ CleveRoids.mouseOverUnit = nil
 -- Environment flags
 CleveRoids.hasSuperwow = SetAutoloot and true or false
 CleveRoids.hasTurtle   = (type(_G.TURTLE_WOW_VERSION) ~= "nil")
-CleveRoids.hasReliquary = (RQ_GetVersion ~= nil)
 CleveRoids.supported   = CleveRoids.hasTurtle
 
 CleveRoids.ParsedMsg = {}
@@ -291,14 +290,6 @@ local function PrintFeatures()
         end
     end
     if CleveRoids.hasUnitXP then table.insert(features, "UnitXP") end
-    if CleveRoids.hasReliquary then
-        local ok, major, minor, patch = pcall(RQ_GetVersion)
-        if ok and major then
-            table.insert(features, string.format("Reliquary v%d.%d.%d", major, minor, patch))
-        else
-            table.insert(features, "Reliquary")
-        end
-    end
     if CleveRoids.hasTurtle then table.insert(features, "Turtle") end
 
     if table.getn(features) > 0 then