Use newer Java features in places where it makes sense and more (#1009)

src/main/java/carpet/settings/ParsedRule.java

@@ -2,7 +2,6 @@ package carpet.settings;
 
 import carpet.utils.Translations;
 import carpet.utils.Messenger;
-import com.google.common.collect.ImmutableList;
 import net.minecraft.server.command.ServerCommandSource;
 
 import java.lang.reflect.Constructor;
@@ -11,6 +10,7 @@ import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.List;
 import java.util.Locale;
+import java.util.stream.Collectors;
 
 import org.apache.commons.lang3.ClassUtils;
 
@@ -29,9 +29,9 @@ public final class ParsedRule<T> implements Comparable<ParsedRule> {
     public final String name;
     public final String description;
     public final String scarpetApp;
-    public final ImmutableList<String> extraInfo;
-    public final ImmutableList<String> categories;
-    public final ImmutableList<String> options;
+    public final List<String> extraInfo;
+    public final List<String> categories;
+    public final List<String> options;
     public boolean isStrict;
     public boolean isClient;
     public final Class<T> type;
@@ -47,8 +47,8 @@ public final class ParsedRule<T> implements Comparable<ParsedRule> {
         this.type = (Class<T>) field.getType();
         this.description = rule.desc();
         this.isStrict = rule.strict();
-        this.extraInfo = ImmutableList.copyOf(rule.extra());
-        this.categories = ImmutableList.copyOf(rule.category());
+        this.extraInfo = List.of(rule.extra());
+        this.categories = List.of(rule.category());
         this.scarpetApp = rule.appSource();
         this.settingsManager = settingsManager;
         this.validators = new ArrayList<>();
@@ -76,22 +76,22 @@ public final class ParsedRule<T> implements Comparable<ParsedRule> {
         this.defaultAsString = convertToString(this.defaultValue);
         if (rule.options().length > 0)
         {
-            this.options = ImmutableList.copyOf(rule.options());
+            this.options = List.of(rule.options());
         }
         else if (this.type == boolean.class){
-            this.options = ImmutableList.of("true","false");
+            this.options = List.of("true","false");
         }
         else if(this.type == String.class && categories.contains(RuleCategory.COMMAND))
         {
-            this.options = ImmutableList.of("true", "false", "ops");
+            this.options = List.of("true", "false", "ops");
         }
         else if (this.type.isEnum())
         {
-            this.options = Arrays.stream(this.type.getEnumConstants()).map(e -> ((Enum) e).name().toLowerCase(Locale.ROOT)).collect(ImmutableList.toImmutableList());
+            this.options = Arrays.stream(this.type.getEnumConstants()).map(e -> ((Enum) e).name().toLowerCase(Locale.ROOT)).collect(Collectors.toUnmodifiableList());
         }
         else
         {
-            this.options = ImmutableList.of();
+            this.options = List.of();
         }
         if (isStrict && !this.options.isEmpty())
         {