more work on api & rename to Pilz.Net

Pilz.Net/Api/IApiServer.cs

@@ -0,0 +1,22 @@
+namespace Pilz.Net.Api;
+
+public interface IApiServer
+{
+    public delegate void OnCheckAuthenticationEventHandler(object sender, ApiAuthCheckEventArgs e);
+
+    event OnCheckAuthenticationEventHandler? OnCheckAuthentication;
+
+    string ApiUrl { get; }
+
+    bool EnableAuth { get; set; }
+
+    IMessageSerializer Serializer { get; }
+
+    void Start();
+
+    void Stop();
+
+    void RegisterHandler<T>(T instance) where T : class;
+
+    void RegisterHandler(Delegate handler);
+}