Fixes some savage fail problems

Fixes item not being returned when salvage fails
Removes some redundancy when giving back items
Makes extended salvage return 50% of the salvage (no items if only one item would be returned)
Adds a better message when failing to salvage extended salvage items
Fixes a bug in the caching of smith presets

src/main/java/net/knarcraft/blacksmith/config/scrapper/ScrapperNPCSettings.java

@@ -127,10 +127,20 @@ public class ScrapperNPCSettings implements TraitSettings<ScrapperSetting> {
      * @return <p>The salvage fail message</p>
      */
     @NotNull
-    public String getFailMessage() {
+    public String getFailSalvageMessage() {
         return asString(ScrapperSetting.FAIL_SALVAGE_MESSAGE);
     }
 
+    /**
+     * Gets the message to display when a scrapper fails to salvage an item without durability
+     *
+     * @return <p>The extended salvage fail message</p>
+     */
+    @NotNull
+    public String getFailExtendedSalvageMessage() {
+        return asString(ScrapperSetting.FAIL_SALVAGE_EXTENDED_MESSAGE);
+    }
+
     /**
      * Gets the message to use for displaying salvage cost
      *