Fix PrototypeLoader and RegionLoader with version tag

BauSystem_Main/src/de/steamwar/bausystem/region/loader/PrototypeLoader.java

@@ -44,7 +44,7 @@ public class PrototypeLoader {
             throw new SecurityException(e.getMessage(), e);
         }
 
-        int currentVersion = yapionObject.getPlainValue("@version");
+        int currentVersion = yapionObject.getPlainValueOrDefault("@version", -1);
         if (currentVersion != loadedVersion && loadedVersion != 0) {
             throw new SecurityException("Version was not the specified version needed.");
         }

BauSystem_Main/src/de/steamwar/bausystem/region/loader/RegionLoader.java

@@ -57,7 +57,7 @@ public class RegionLoader {
             throw new SecurityException(e.getMessage(), e);
         }
 
-        int currentVersion = yapionObject.getPlainValue("@version");
+        int currentVersion = yapionObject.getPlainValueOrDefault("@version", -1);
         if (currentVersion != loadedVersion && loadedVersion != 0) {
             throw new SecurityException("Version was not the specified version needed.");
         }