Added Raymath binding + Initial examples

- Added Raymath.cs binding. Raylib.cs depends on this since they both share some types.
- Bindings moved into source directly.
- Inital examples port alot of syntax still needs to be fixed.
- Couldn't get cppsharp to work correctly so using a custom generator(WIP).

ExampleApplication/Program.cs

@@ -6,9 +6,11 @@ namespace ExampleApplication
     static class Program
     {
         static void Main(string[] args)
-        {     
+        {
+            var a = new Vector2(100, 30);
+            var b = new Vector2(100, 30);
+            var c = Vector2Add(a, b);
             Examples.core_basic_window();
-            // DrawControl.Run();
         }
     }
 }