core.kernel.mainloop()
This core function is invoked by FlyWithLua's callbacks and takes care of executing all the tasks in the specific queue.
An instance of this function is used to manage some recurrent loops (FRAME_LOOP, DRAW_LOOP, OFTEN_LOOP, SOMETIMES_LOOP).
The specific loop is passed as number (see ams.C) by the callback; if it's 0 (meaning the FRAME_LOOP), the function automatically executes the kernel task (task #1) before anything else.
