Optimize some stuff and fix some other stuff

BauSystem/BauSystem_Main/src/de/steamwar/bausystem/region/RegionBackups.java

@@ -25,7 +25,6 @@ import lombok.RequiredArgsConstructor;
 
 import javax.annotation.CheckReturnValue;
 import javax.annotation.Nullable;
-import java.util.Comparator;
 import java.util.List;
 import java.util.Optional;
 
@@ -42,7 +41,7 @@ public interface RegionBackups {
 
     @RequiredArgsConstructor
     @Getter
-    abstract class Backup implements Comparator<Backup> {
+    abstract class Backup implements Comparable<Backup> {
         @NonNull
         private final BackupType type;
 
@@ -60,8 +59,8 @@ public interface RegionBackups {
         public abstract long getCreationTime();
 
         @Override
-        public int compare(Backup o1, Backup o2) {
-            return Long.compare(o1.getCreationTime(), o2.getCreationTime());
+        public int compareTo(Backup o) {
+            return Long.compare(getCreationTime(), o.getCreationTime());
         }
     }