Moved example menu

- Menu for example removed from Test projects and moved to exampes.
- Changed nativeLibName from raylib.dll to raylib. It should find the correct one this way but might need a dll.config file.

Examples/Test.cs

@@ -0,0 +1,30 @@
+using System;
+using System.IO;
+using static Raylib.Raylib;
+
+namespace Examples
+{
+    public class Test
+    {
+        // menu for testing examples
+        public static void Run(string[] args)
+        {
+            Console.WriteLine("Welcome to raylib-cs!");
+
+            while (true)
+            {
+                Console.WriteLine("Enter path to example");
+
+                var filePath = Console.ReadLine();
+                var name = Path.GetFileNameWithoutExtension(filePath);
+
+                Console.WriteLine("Running example " + filePath);
+
+                ChangeDirectory(filePath);
+                Type.GetType(name)?.GetMethod("Main")?.Invoke(null, args);
+
+                Console.WriteLine();
+            }
+        }
+    }
+}