Start adding user API calls

lib/discord/networking/user.dart

@@ -0,0 +1,60 @@
+import 'dart:convert';
+
+import 'package:dio/dio.dart';
+import 'package:libac_dart/discord/networking/endpoints.dart';
+
+import '../structures/user.dart';
+
+class UserPackets {
+  /// Requests the current user from Discord's servers
+  static Future<User> getCurrentUser() async {
+    Dio dio = Dio();
+    var reply = await dio.get(
+        "${DiscordEndpoints.BaseURL}${DiscordEndpoints.Users}${DiscordEndpoints.ME}");
+
+    return User.fromJson(reply.data as String);
+  }
+
+  /// Requests the user from Discord's servers
+  ///
+  /// [id] is expected to be a valid Discord User ID
+  static Future<User> getUser(int id) async {
+    Dio dio = Dio();
+    var reply = await dio
+        .get("${DiscordEndpoints.BaseURL}${DiscordEndpoints.Users}/${id}");
+
+    return User.fromJson(reply.data as String);
+  }
+
+  /// Updates any values that were set in the packet, and returns the updated user
+  ///
+  /// Fires a User Update gateway event
+  static Future<User> updateCurrentUser(ModifyCurrentUserPacket mcup) async {
+    Dio dio = Dio();
+    var reply = await dio.patch(
+        "${DiscordEndpoints.BaseURL}${DiscordEndpoints.Users}${DiscordEndpoints.ME}",
+        data: mcup.encode());
+
+    return User.fromJson(reply.data as String);
+  }
+}
+
+class ModifyCurrentUserPacket {
+  String? username;
+  String? avatar;
+  String? banner;
+
+  ModifyCurrentUserPacket({this.username, this.avatar, this.banner});
+
+  String encode() {
+    return json.encode(toJson());
+  }
+
+  Map<String, dynamic> toJson() {
+    return {
+      if (username != null) "username": username,
+      if (avatar != null) "avatar": avatar,
+      if (banner != null) "banner": banner,
+    };
+  }
+}