Add some helpers and wrappers, bump libac-dart dep

lib/nbt/nbtHelpers.dart

@@ -0,0 +1,36 @@
+import 'package:libac_dart/nbt/SnbtIo.dart';
+import 'package:libac_dart/nbt/impl/CompoundTag.dart';
+import 'package:shared_preferences/shared_preferences.dart';
+
+class NBTHelper {
+  /// Commits NBT Data to Shared Preferences, performing all the secret magic that makes it happen
+  ///
+  /// [data] - The data to be encoded and saved
+  /// [name] - The name to give the entry.
+  static Future<void> CommitNBT(
+      {required CompoundTag data, required String name}) async {
+    String encoded = SnbtIo.writeToString(data);
+
+    SharedPreferences prefs = await SharedPreferences.getInstance();
+    await prefs.setString(name, encoded);
+  }
+
+  /// This function retrieves the NBT Data and turns it back into a CompoundTag
+  ///
+  /// [name] - The name of the entry to retrieve
+  static Future<CompoundTag> GetNBT({required String name}) async {
+    SharedPreferences prefs = await SharedPreferences.getInstance();
+    String data = prefs.getString(name) ?? "";
+    if (data.isEmpty) {
+      return CompoundTag();
+    } else {
+      return await SnbtIo.readFromString(data) as CompoundTag;
+    }
+  }
+
+  /// Resets and clears the persistent storage.
+  static Future<void> ResetPersistentNBTStore() async {
+    SharedPreferences prefs = await SharedPreferences.getInstance();
+    await prefs.clear();
+  }
+}