Migrate settings into its own special entry to utilize type adapters fully.

lib/settingsEntry.dart

@@ -0,0 +1,20 @@
+import 'package:hive/hive.dart';
+import 'package:servermanager/credentials.dart';
+import 'package:servermanager/mod.dart';
+
+part 'settingsEntry.g.dart';
+
+@HiveType(typeId: 0)
+class SettingsEntry {
+  @HiveField(0)
+  List<Mod> mods = [];
+
+  @HiveField(1)
+  String steamcmd_path = "";
+
+  @HiveField(2)
+  String game_path = "";
+
+  @HiveField(3)
+  Credentials? steam_creds;
+}