Improve performance of resolve methods in PermissionHolder, other cleanup

sponge/src/main/java/me/lucko/luckperms/sponge/service/LuckPermsService.java

@@ -311,7 +311,7 @@ public class LuckPermsService implements PermissionService {
     @RequiredArgsConstructor
     @EqualsAndHashCode
     @ToString
-    public static class DescriptionBuilder implements PermissionDescription.Builder {
+    public static final class DescriptionBuilder implements PermissionDescription.Builder {
         private final LuckPermsService service;
         private final PluginContainer container;
         private final Map<String, Tristate> roles = new HashMap<>();
@@ -365,7 +365,7 @@ public class LuckPermsService implements PermissionService {
     @AllArgsConstructor
     @EqualsAndHashCode
     @ToString
-    public static class Description implements PermissionDescription {
+    public static final class Description implements PermissionDescription {
         private final LuckPermsService service;
         private final PluginContainer owner;
         private final String id;

sponge/src/main/java/me/lucko/luckperms/sponge/service/calculated/OptionLookup.java

@@ -33,7 +33,7 @@ import me.lucko.luckperms.api.context.ImmutableContextSet;
 @ToString
 @EqualsAndHashCode
 @AllArgsConstructor(staticName = "of")
-public class OptionLookup {
+public final class OptionLookup {
 
     private final String key;
     private final ImmutableContextSet contexts;

sponge/src/main/java/me/lucko/luckperms/sponge/service/calculated/PermissionLookup.java

@@ -33,7 +33,7 @@ import me.lucko.luckperms.api.context.ImmutableContextSet;
 @ToString
 @EqualsAndHashCode
 @AllArgsConstructor(staticName = "of")
-public class PermissionLookup {
+public final class PermissionLookup {
 
     private final String node;
     private final ImmutableContextSet contexts;

sponge/src/main/java/me/lucko/luckperms/sponge/service/references/SubjectCollectionReference.java

@@ -35,7 +35,7 @@ import java.lang.ref.WeakReference;
 @ToString(of = "collection")
 @EqualsAndHashCode(of = "collection")
 @RequiredArgsConstructor(staticName = "of")
-public class SubjectCollectionReference {
+public final class SubjectCollectionReference {
 
     @Getter
     private final String collection;

sponge/src/main/java/me/lucko/luckperms/sponge/service/references/SubjectReference.java

@@ -40,7 +40,7 @@ import java.util.List;
 @ToString(of = {"collection", "identifier"})
 @EqualsAndHashCode(of = {"collection", "identifier"})
 @RequiredArgsConstructor(staticName = "of")
-public class SubjectReference {
+public final class SubjectReference {
     public static SubjectReference deserialize(String s) {
         List<String> parts = Splitter.on('/').limit(2).splitToList(s);
         return of(parts.get(0), parts.get(1));