two getthumbnail funs merget into one

src/net/torvald/terrarum/savegame/DiskSkimmer.kt

@@ -447,12 +447,20 @@ removefile:
         fa.close()
     }
 
+    /**
+     * @return Save type (0b 0000 00ab)
+     *                   b: unset - full save; set - quicksave (only applicable to worlds -- quicksave just means the disk is in dirty state)
+     *                   a: set - generated by autosave
+     */
     fun getSaveMode(): Int {
         val fa = RandomAccessFile(diskFile, "rwd")
         fa.seek(49L)
         return fa.read().also { fa.close() }
     }
 
+    /**
+     * @return 1 if the savegame is player data, 2 if the savegame is world data, 0 otherwise
+     */
     fun getSaveKind(): Int {
         val fa = RandomAccessFile(diskFile, "rwd")
         fa.seek(50L)