Added many missing things

* Steel Plate added to Blacksmithing
* Intact Pounder Mainframe added to Gnomer
* Schematic: Hypertech Battery Pack added to Gnomer
* Missing rare trash drops from Maraudon
* Missing rare trash drops from Crescent Grove
* Missing epic trash drops from Molten Core
* Missing Talisman of Binding Shard from Garr
* Missing custom items from the Abyssal Council
* Missing custom items from the Elemental Invasion
* Added Concavius

Core/ButtonRegistry.lua

@@ -904,6 +904,11 @@ AtlasLoot_ButtonRegistry = {
         Back_Page = "PRE60SET";
         Back_Title = AL["Pre 60 Sets"];
     };
+    ["SteelPlate"] = {
+        Title = AL["Steel Plate"];
+        Back_Page = "CRAFTSET";
+        Back_Title = AL["Crafted Sets"];
+    };
     ["ImperialPlate"] = {
         Title = AL["Imperial Plate"];
         Back_Page = "CRAFTSET";