enable vsync in rgfw shell, to majorly decrease cpu usage

ffi/rgfw-export.c

@@ -30,6 +30,11 @@ void swapBuffers(RGFW_window* window) {
   RGFW_window_swapBuffers_OpenGL(window);
 }
 
+void enableVsync(RGFW_window* window) {
+  // A swap interval of 1 will enable vsync
+  RGFW_window_swapInterval_OpenGL(window, 1);
+}
+
 void writeClipboard(char* string, int stringSize) {
   RGFW_writeClipboard(string, stringSize);
 }

ffi/rgfw-import.sml

@@ -11,6 +11,8 @@ struct
     _import "shouldCloseWindow" public : window -> bool;
   val swapBuffers =
     _import "swapBuffers" public : window -> unit;
+  val enableVsync =
+    _import "enableVsync" public : window -> unit;
   val pollEvents =
     _import "pollEvents" public reentrant : unit -> unit;