adding 'kind flag' to the savegame format so the file can be determined if it contains player or world data

src/net/torvald/terrarum/modulebasegame/serialise/QuickSaveThread.kt

@@ -140,9 +140,12 @@ class QuickSingleplayerWorldSavingThread(
         }
 
 
+        disk.saveKind = VDSaveKind.WORLD_DATA
+
         skimmer.rewriteDirectories()
         skimmer.injectDiskCRC(disk.hashCode())
         skimmer.setSaveMode(1 + 2 * isAuto.toInt())
+        skimmer.setSaveKind(VDSaveKind.WORLD_DATA)
 
         printdbg(this, "Game saved with size of ${outFile.length()} bytes")