settings system

src/main/java/carpet/settings/RuleCategory.java

@@ -0,0 +1,13 @@
+package carpet.settings;
+
+import java.util.Locale;
+
+public enum RuleCategory {
+    BUGFIX, SURVIVAL, CREATIVE, EXPERIMENTAL, OPTIMIZATIONS, FEATURE, COMMANDS ;
+
+    public final String lowerCase;
+
+    RuleCategory() {
+        this.lowerCase = this.name().toLowerCase(Locale.ROOT);
+    }
+}