toggleFullscreen method to enter / leave borderless fullscreen, added isFullscreen getter. Restores the previous window position and size after leaving fullscreenisMinimized getter. This fixes error spam while the window is minimized in windows (incomplete framebuffer warnings)requestClose method to shut down the application as if the window had been closedsetCreateSecondaryContext(true) is called (defaults to false). Can be retrieved using secondaryContext(), analogous to existing window() method. Useful for multithreaded interaction with OpenGL, like asset loadingscheduledUpdate method which is called in the interval specified by calling setScheduledUpdateInterval (defaults to 0, which means never). Useful to perform clean up tasks