fix(code-quality): Address event invocation and null dereference warnings

Author: Coder

DotNetPlugin.Impl/Mcp/McpHttpServer.cs

@@ -99,7 +99,8 @@ private async void OnRequest ( IAsyncResult ar )
 
         if ( RequestReceived != null )
         {
-            await RequestReceived.Invoke ( ctx );
+            var handler = RequestReceived;
+            await handler.Invoke ( ctx );
         }
         else
         {

DotNetPlugin.Impl/Plugin.EventCallbacks.cs

@@ -105,7 +105,14 @@ public static void OutputDebugString ( ref Plugins.PLUG_CB_OUTPUTDEBUGSTRING inf
     [EventCallback ( Plugins.CBTYPE.CB_BREAKPOINT )]
     public static void Breakpoint ( ref Plugins.PLUG_CB_BREAKPOINT info )
     {
-        LogInfo ( $"Breakpoint " + info.breakpoint.Value.addr.ToHexString() + " in " + info.breakpoint.Value.mod );
+        if (info.breakpoint.HasValue)
+        {
+            LogInfo ( $"Breakpoint " + info.breakpoint.Value.addr.ToHexString() + " in " + info.breakpoint.Value.mod );
+        }
+        else
+        {
+            LogInfo ( "Breakpoint event received, but info.breakpoint is null." );
+        }
     }
 
     [EventCallback ( Plugins.CBTYPE.CB_SYSTEMBREAKPOINT )]