Implement IntTag

lib/nbt/Tag.dart

@@ -3,7 +3,7 @@ import 'package:libac_flutter/nbt/impl/CompoundTag.dart';
 import 'package:libac_flutter/nbt/impl/DoubleTag.dart';
 import 'package:libac_flutter/nbt/impl/EndTag.dart';
 import 'package:libac_flutter/nbt/impl/FloatTag.dart';
-import 'package:libac_flutter/nbt/impl/TagInt.dart';
+import 'package:libac_flutter/nbt/impl/IntTag.dart';
 import 'package:libac_flutter/nbt/impl/TagLong.dart';
 import 'package:libac_flutter/nbt/impl/TagShort.dart';
 
@@ -98,7 +98,7 @@ abstract class Tag {
       case TagType.Short:
         return new TagShort(value: 0);
       case TagType.Int:
-        return new TagInt(value: 0);
+        return new IntTag();
       case TagType.Long:
         return new TagLong(value: 0);
       case TagType.Float:

lib/nbt/impl/IntTag.dart

@@ -1,18 +1,26 @@
 import 'package:libac_flutter/nbt/Stream.dart';
 import 'package:libac_flutter/nbt/Tag.dart';
 
-class TagInt extends Tag {
+class IntTag extends Tag {
-  final int value;
+  int _value = 0;
-  TagInt({required this.value});
+  IntTag();
+
+  IntTag._(int value) {
+    _value = value;
+  }
+
+  static IntTag valueOf(int value) {
+    return IntTag._(value);
+  }
 
   @override
   void readValue(ByteLayer data) {
-    // TODO: implement readValue
+    _value = data.readInt();
   }
 
   @override
   void writeValue(ByteLayer data) {
-    // TODO: implement writeValue
+    data.writeInt(_value);
   }
 
   @override