Improve code structure

- Add separate API project
- Add notification system

HyperbolicDownloaderApi/Networking/DataContainer.cs

@@ -0,0 +1,14 @@
+namespace HyperbolicDownloaderApi
+{
+    internal class DataContainer
+    {
+        public string EventName { get; set; }
+        public string JsonData { get; set; }
+
+        public DataContainer(string eventName, string jsonData)
+        {
+            JsonData = jsonData;
+            EventName = eventName;
+        }
+    }
+}