completely abolishing GSON; new save format impl wip

src/net/torvald/terrarum/utils/JsonFetcher.kt

@@ -1,5 +1,7 @@
 package net.torvald.terrarum.utils
 
+import com.badlogic.gdx.utils.JsonReader
+import com.badlogic.gdx.utils.JsonValue
 import net.torvald.terrarum.AppLoader.printdbg
 
 /**
@@ -10,7 +12,7 @@ object JsonFetcher {
     private var jsonString: StringBuffer? = null
 
     @Throws(java.nio.file.NoSuchFileException::class)
-    operator fun invoke(jsonFilePath: String): com.google.gson.JsonObject {
+    operator fun invoke(jsonFilePath: String): JsonValue {
         jsonString = StringBuffer() // reset buffer every time it called
         readJsonFileAsString(jsonFilePath)
 
@@ -20,14 +22,11 @@ object JsonFetcher {
             throw Error("[JsonFetcher] jsonString is null!")
         }
 
-        val jsonParser = com.google.gson.JsonParser()
-        val jsonObj = jsonParser.parse(jsonString.toString()).asJsonObject
-
-        return jsonObj
+        return JsonReader().parse(jsonString.toString())
     }
 
     @Throws(java.nio.file.NoSuchFileException::class)
-    operator fun invoke(jsonFile: java.io.File): com.google.gson.JsonObject {
+    operator fun invoke(jsonFile: java.io.File): JsonValue {
         jsonString = StringBuffer() // reset buffer every time it called
         readJsonFileAsString(jsonFile.canonicalPath)
 
@@ -37,10 +36,7 @@ object JsonFetcher {
             throw Error("[JsonFetcher] jsonString is null!")
         }
 
-        val jsonParser = com.google.gson.JsonParser()
-        val jsonObj = jsonParser.parse(jsonString.toString()).asJsonObject
-
-        return jsonObj
+        return JsonReader().parse(jsonString.toString())
     }
 
     @Throws(java.nio.file.NoSuchFileException::class)
@@ -50,4 +46,14 @@ object JsonFetcher {
         ) // JSON does not require line break
 
     }
+
+    fun forEach(map: JsonValue, action: (String, JsonValue) -> Unit) {
+        var counter = 0
+        var entry = map.child
+        while (entry != null) {
+            action(entry.name ?: "(arrayindex $counter)", entry)
+            entry = entry.next
+            counter += 1
+        }
+    }
 }