Simulate a ball in a walled maze on a board that is tilted up, down, left, right or flat at given times, and return the ball's position at a given end time.

A maze with walls holds one ball on a board that can be tilted up, down, left, right or flat. Each second, if the board is not flat and the cell next to the ball in the tilt direction is not a wall, the ball moves one cell that way. Given the initial maze and ball, a list of events (at a given time the board is tilted to a given direction) and an end time, return the ball's position at the end time.