A lot of tests, and some improvements

Adds a lot more tests for some utility classes
Adds a new option to disable the hard-coded limitation "EnchantmentTarget.BREAKABLE" which can be useful for servers with custom items or similar.
Makes enchantment name matching case-insensitive.
Prevents an exception is enchantment name contains invalid characters.
Makes invalid objects supplied to asStringList return null instead of throwing an exception.
Uses isBlank instead of trim.isEmpty in the isEmpty method
Re-uses the random generator if calculating salvage several times

src/main/java/net/knarcraft/blacksmith/config/GlobalSetting.java

@@ -49,7 +49,15 @@ public enum GlobalSetting {
      * The cost for repairing a damaged anvil
      */
     ANVIL_DAMAGED_COST("global.damagedAnvilReforgingCost", SettingValueType.POSITIVE_DOUBLE, 20.0,
-            "damagedAnvilReforgingCost");
+            "damagedAnvilReforgingCost"),
+
+    /**
+     * Whether to disable the normal limitation for which items are reforgeAble
+     *
+     * <p>If true, all items instanceof Damageable can be reforged</p>
+     */
+    DISABLE_MATERIAL_LIMITATION("global.disableMaterialLimitation", SettingValueType.BOOLEAN, false,
+            "disableMaterialLimitation");
 
     private final String path;
     private final String parent;

src/main/java/net/knarcraft/blacksmith/config/GlobalSettings.java

@@ -295,6 +295,15 @@ public class GlobalSettings {
         }
     }
 
+    /**
+     * Whether to disable the "EnchantmentTarget.BREAKABLE" limitation
+     *
+     * @return <p>True if the material limitation is disabled</p>
+     */
+    public boolean disableMaterialLimitation() {
+        return asBoolean(GlobalSetting.DISABLE_MATERIAL_LIMITATION);
+    }
+
     /**
      * Gets the given value as a boolean
      *

src/main/java/net/knarcraft/blacksmith/config/NPCSettings.java

@@ -460,7 +460,8 @@ public class NPCSettings {
             }
 
             Material material = InputParsingHelper.matchMaterial(item);
-            if (material != null && ItemHelper.isRepairable(new ItemStack(material, 1))) {
+            boolean limitationDisabled = BlacksmithPlugin.getInstance().getSettings().disableMaterialLimitation();
+            if (material != null && ItemHelper.isRepairable(new ItemStack(material, 1), limitationDisabled)) {
                 if (!blacklist) {
                     reforgeAbleItems.add(material);
                 } else {